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Jeremy Piven, Emmys Backstage

Lisa O'Connor/ZUMAPress.com

You know a party is good when celebs who aren’t even on the host network show up...especially ones who scored Emmys that night! Such was the case at HBO’s bash at the Pacific Design Center, which I dished about earlier. Winners Katherine Heigl and America Ferrera swung by, along with Kanye West and Minnie Driver.  And HBO's man of the hour, Jeremy Piven, finally made it to the company bash, Emmy in hand, to hang out with his Entourage boys.

Inside the party, Journey’s Don’t Stop Believing got back-to-back play, perhaps as a tribute to the Sopranos series finale episode? Most of the cast was there, including James Gandolfini, Jamie-Lynn Sigler, Edie Falco and Lorraine Bracco. Revelers celebrated with Belvedere Thai-tinis and Moët champagne flowing freely at the bars, and partygoers like Heidi Klum and Queen Latifah sampled lobster tempura, beef satay and Thai chicken toasts, the handiwork of  Wolfgang Puck.

Teri Hatcher

Kevin Parry/WireImage.com

Likewise, the celebrating went into the wee hours over at the TV Guide after-party where a cover act billing itself as Band from TV and consisting of Bonnie Somerville, Hugh Laurie, James Denton and Bob Guinea took the stage around 12:30 and got the dance floor rockin’. They even had a surprise singer: none other than Teri Hatcher herself! The Desperate Housewives honey joined them onstage to belt out Leave the Pieces by the Wreckers. Who knew she had such pipes?

Meanwhile on the patio, Ryan Seacrest was cooling his heels at a table with a gaggle of gals. Simon Cowell was hangin’ with g-f Terri Seymour for some of the night but lingered late night with a ton of other ladies at a table.

Simon Cowell, Paula Abdul, Randy Jackson

Alexandra Wyman/WireImage.com

And last but not least, Paula Abdul was wobbling around the bash hand in hand with her new boy-toy, J.T. Torregiani. Don’t get us wrong, the loopy but lovable gal had good reason to be bobbin’ and weavin’: Her cream-colored peek-a-boob dress had a train a mile long!

—Filed by Cristina Gibson