ABC/Danny Feld

Leven Rambin, aka home wrecker Riley from Terminator: The Sarah Connor Chronicles, is coming to Grey's Anatomy Nov. 19, and her home-wrecking streak might not be done yet...

We've been told that Leven's character features heavily in the Nov. 19 episode, titled "Holidaze," and that during the course of that episode (which spans several weeks of story time), "Mark (Eric Dane) and Lexie (Chyler Leigh) must cope with the shocking arrival of a woman from his past."

What's so shocking? Well, rumor has it that Leven plays Mark "McSteamy" Sloan's long-lost daughter. Gasp!

Do you see a family resemblance?

And if you're a "Sexie" fan, is it better if this newcomer is a romantic rival or if she's just a reminder that the Mark-Lexie romance is sometimes just a smidge age-inappropriate? (Seriously, Leven and Chyler look like they could be sorority sisters!)

Last but not least, is anyone out there a tiny bit suspicious that this blond newcomer might actually be the daughter that Izzie (Katherine Heigl) gave up for adoption? What? We're just paranoid, OK?!

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Giovanni Rufino / The CW

What a motley crew this is!

Look closely at the official snapshot of Lady Gaga on the set of Gossip Girl, and you'll see that she's fallen in with the likes of a shaggy lumberjack (hello, Penn Badgley) and what appears to be a Cockney English flower girl (Leighton Meester as Blair Waldorf as Audrey Hepburn as Eliza Doolittle?)—or perhaps Leighton's just wearing a beret/snood and a light-absorbing black getup.

Seriously though, somewhere in the world, right this minute, a celebrity photo stylist is hyperventilating.

Gaga, seen here wearing a red sequined cocktail dress adorned with faux nipple tape, is set to perform one of her pop-hit songs on the Nov. 16 episode of Gossip Girl, entitled, "The Last Days of Disco Stick."

And you totally spotted the mini-me version of Gaga on last night's ep of Gossip Girl, right?

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Want to see more big stars on the small screen, including SamRo on 90210? Click through our TV Celebrity Stunt Casting gallery.

Jack Rowand/The CW

• Supernatural: Check out the promo photo the CW just released of heiress Paris Hilton, who guests on this Thursday's episode of Supernatural as a demon who feeds on the disorienting power of celebrity.

• Grey's Anatomy: Kim Raver checks in to Grey's Anatomy on Nov. 12 as a "possible love interest" for Kevin McKidd's Owen Hunt. Ugh. Shouldn't she be over on Fox toying with Jack Bauer instead?

• Parenthood: Gilmore Girl Lauren Graham might take over Maura Tierney's role on the NBC series Parenthood. Tierney departed the series to focus on her breast-cancer treatments.

• Bored to Death: Jason Schwartzman lives to solve another crime. HBO's slacker-noir detective comedy Bored to Death has been renewed for a second season.

• Melrose Place: The New York Post's PopWrap blog asserts that Ashlee Simpson can't act. Anyone care to challenge that thesis?

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Want more celeb guest stars? Don't miss our TV Stunt Casting gallery!

Andrew Eccles/The CW

Already loving this season's hottest new TV stars? We don't blame you!

From those we barely had a chance to know (R.I.P., beautiful people of The Beautiful Life) to those who make us pause our DVRs the instant they walk onscreen (have you seen Colin Egglesfield?), we've put together your go-to guide of who's who of the new fall season.

Comedians? Starlets? Sexy studs? You name it, we've got you covered.

Don't believe us? See for yourself and enjoy our Swoothworthy Fresh Faces of Fall TV photo gallery.

ABC

Charisma Carpenter looks pretty good in skintight leather, doesn't she? The former Buffy and Angel star appears on the Nov. 7 season premiere of the syndicated cult hit Legend of the Seeker, and we've got the exclusive first promo still!

Carpenter plays Triana, one of the feisty Mord-Sith warrior women who regularly make Richard Cypher's life miserable—when they're not trying to sex him up, that is.

Look for season two to go heavy on the superhot sci-fi ladies. In addition to Carpenter, Tabrett Bethell joins the cast as Mord-Sith, sister-friend Cara, a new regular character with designs on the Seeker, and Aimee Teegarden (Friday Night Lights) guest stars as a Confessor who gets between Richard and Kahlan (Bridget Regan)

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Giovanni Rufino / The CW

Episode four of Gossip Girl this season is going to be a celebrity bonanza, as you can see for yourself in four all-new scene shots just released by the CW.

In ep four, airing Oct. 5, Hilary Duff arrives on the scene to canoodle with Penn Badgley's Dan Humphrey (the ep is titled "Dan de Fleurette,") and both Tyra Banks and designer Tory Burch are on the scene as well.

Why?

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Quantrell Colbert/The CW

Even if you are sick to death of all things bloodsucker—or pretend to be—take our advice: Don't fight it, and tune in to the CW when The Vampire Diaries returns tomorrow night.

However loosely show runner Kevin Williamson plans to follow the original Vampire Diaries novels, this saga's storylines are dark. Forks is Fantasyland compared with all the evil going down in Mystic Falls.

And just forget Teams Jacob and Edward: The darkest thing in their pasts is...Wait, do those paragons of virtue have anything to hide? Wait until you learn the sinister secrets Stefan and Damon are harboring, and then you'll know what a wicked vamp looks like.

Are you ready to sink your teeth into what will become TV's most bizarre love triangle? Then click on the thumbnails below to check out our special Vampire Diaries Spoiler Stills photo gallery, where you can sneak some peeks of upcoming episodes—and catch up on the haps in Mystic Falls. You know, just in case a vamp erased your memory.

Michael Becker/FOX

What can we say? We love it when major tabloid-cover celebrities deign to appear on one of our favorite shows. It's not just that an appearance by Britney Spears, Victoria Beckham and Katie Holmes is inherently exciting; it's that when celebs of their caliber sign on the dotted line, they bring in a major publicity boost to some of our favorite series.

Brit's appearance on HIMYM not only launched her comeback, but launched that wonderful comedy into the stratosphere. Katie Holmes' gig on SYTYCD put a blazing spotlight on that fabulous reality show. And Nicole Richie's gig on Chuck was a creative and promotional triumph.

Of course, sometimes celeb guest gigs are gratuitous and strained, usually if they involve someone from The Hills, but still, we have to give those girls props for trying to put in their actress internship hours.

To honor these memorable moments in TV, we've put together a gallery of some of the most notable TV stunt-casting events from the past couple of years, and once your memory has been jogged a little, we want to know: Which was the best? Which was the most embarrassing failure? Tell us what you think!

Oh heck yes! Gossip Girl isn't quite back on our TVs yet—we have to wait for Sept. 14 for that happy occasion—but to tide us over, the CW has kindly delivered five fabulous sneak peeks of the season premiere. Press play above to see Nate (Chace Crawford) meet his new frenemy and playmate Bree Buckley (Joanna Garcia), and then click to see Chuck Bass (Ed Westwick) be awesome, Serena (Blake Lively) pose for the cameras and the van der Woodsen-Humphrey clan gathered around the dinner table!

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ABC/CRAIG SJODIN

The stars are here!

We've got your first look at the celebrity-professional pairings for Dancing With the Stars season nine, and they look like tremendous fun! (How cute is new dance team Melissa Joan Hart and Mark Ballas?)

Interested in a peek at kooky Kelly Osbourne and her new dance partner, Louis van Amstel?

Ready to check out Debi Mazar's slamming postbaby body?

Want to see what Kathy Ireland looks like 15 years after her last Sports Illustrated swimsuit issue cover?

Click one of the thumbnails below and take a look!

XPOSUREPHOTOS.COM

Here's a Hint: The bride is pregnant, and she and the groom are getting married after a five-year romance. They've been dating seriously and exclusively for the past two years, and the father-to-be proposed last year in a rainstorm at a gas station on the side of the road.

The two are tying the knot in upstate New York, and the baby is expected to arrive sometime in 2010.

Think you know who's getting hitched? Get the answer right here!

Frederick M. Brown/Getty Images

From Ashlee Simpson Wentz (remember when she played Simon's girlfriend on 7th Heaven?) to famous Friend Courteney Cox, some of our all-time TV faves are streaming back to the small screen this fall.

We caught up with the likes of Tiffani Thiessen (Saved by the Bell), Rebecca Romijn (Ugly Betty) and Dominic Monaghan (Lost) last week at the Television Critics Association press tour and snagged you a ton of dish about the new shows where you can see your old faves in just a few short weeks.

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Click on the thumbails to see the sexy snaps and get the scoop!