For the second time in as many years, Robert Pattinson and Katy Perry came together to help a mutual friend celebrate her birthday.

The Twilight star and pop music hitmaker did some partying into the wee hours last night at Dimples karaoke bar in Burbank for actress Shannon Woodward's big day...

"Rob showed up at about 11:15 and Katy about an hour later," a bar spy tells us.

Pattinson didn't do any singing, but did smoke "like a chimney," says our source.

Perry belted out "All I Want for Christmas." We're told she wasn't exactly on key and apparently cracked something along the lines of, "I can't believe I get paid for this."

Pattinson and Perry were on hand last year at Il Sole restaurant when Woodward hosted a dinner for a small group of friends. (She costars in indie flick Girlfriend with Twilight star Jackson Rathbone.)

Also on hand at Dimples last night was our E! News pal Ashlan Gorse, who happened to be celebrating her B-day, too.

Pattinson and Perry aren't the only celebs we've spotted out and about lately. Below, we give ya a healthy dose of star sightings:

PARTY PALS: Justin Timberlake, partying while supporting his pal Timbaland at the rapper's Shock Value II CD release party in NYC, where guests sipped Neuro Beverage's 901 Gasam-tini.

GOOD COMPANY: Selena Gomez, performing "Whoa Oh" onstage at the Forever the Sickest Kids concert in Hollywood's Playhouse nightclub.

RAY OF LIGHT: Kellan Lutz, toasting television and movie writer Jessica Bendinger during a book party for her debut novel, The Seven Rays.

BEAUTY SHOP: Adam Lambert, picking up Moroccanoil products before jumping onto the Duracell Power Rover in the H&M Artist Gift Lounge at Z100'a Jingle Ball in NYC. Justin Bieber was also there getting a Wonka Purple Card entitling him to 500 packages of his favorite candy.

HOLLY-WOODS: Sacha Baron Cohen, enjoying a guys' night out with friends at Vintage Bar Group's The Woods in Hollywood.

HELPING WITH THE STARS: Carrie Ann Inaba and Matthew Rhys joining AARP Create the Good & EIF's iParticipate volunteer campaigns for a day of service at the Los Angeles Regional Food Bank.

GOING INCOGNITO: Lady Gaga, dressed casually in a black top and black pants at the OPUS Hotel's Elixir Bistro in Vancouver.

HOLIDAY SPIRIT: Jessica Lowndes, stopping by the For Joseph's Chic Holiday Soiree benefiting the National MS Society in NYC.

UP IN THE HOTEL: Anna Kendrick, enjoying some cheese and wine with friends at Chateau Marmont in WeHo.

CALIFORNIA GIRL: Ashley Tisdale, wearing C&C California's Raglan cashmere cardigan while ordering a beverage from Coffee Bean and Tea Leaf in L.A.'s Toluca Lake.

—Reporting by Dahvi Shira and Lindsay Miller

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