The 29-year-old rapper made an explosive surprise performance at TV Guide's packed bash at Hollywood hotspot Les Deux.

Hundreds of attendees rushed the stage when West — who had mocked himself in a comedy sketch on the broadcast — joined John Legend just after 11 p.m. Sunday.

Wearing his customary shades and jumping atop giant speakers, West urged the crowd to roar "Hell yeah!" and "Kan-ye!" West's miniset included his 2005 hit "Gold Digger."

West began another song but said he forgot the lyrics and stopped his performance.

If West was the model of swagger, then Terry O'Quinn was the image of modest calm at TV Guide's Emmy afterparty in Hollywood. Seated at a table near the stage with his wife and manager, O'Quinn said he'd left his best-supporting actor trophy for the island drama "Lost," filmed on O'ahu, in the car.

"In a year, most people you ask won't know who won this award tonight," said O'Quinn, 55, who plays the mysterious John Locke on "Lost."

Guests at the party included Emmy nominee Kyra Sedgwick and her husband, Kevin Bacon, along with Joey Fatone and Lisa Rinna, co-hosts of TV Guide Network's red-carpet show.

"Entertainment Tonight" and People magazine held a party in downtown's sprawling Walt Disney Concert Hall, where guests including Jon Voight, Tori Spelling and nominee Masi Oka of "Heroes" feasted on smoked-scallop burgers, feta tomato tarts and watermelon martinis.

Glass cases of flowers submerged in water decorated the hall's winding interior and adjacent garden. Sets by Duran Duran and high-energy saxophonist Dave Koz added some spirit to the mix.

Across town, HBO's Thai-themed shindig at the Pacific Design Center in West Hollywood was still going strong at 1 a.m.

Revelers — including Los Angeles Mayor Antonio Villaraigosa, accompanied by his daughter — walked on a gold-and-purple carpet surrounded by gold Buddhas and tiered table umbrellas.

"Entourage" star Jeremy Piven, holding his Emmy in one hand and sucking on a sausage-thick cigar with the other, accepted congratulations and hugs. The 42-year-old actor won for supporting actor in a comedy series.

When told by fire officials to stop smoking, Piven moved to another spot — and continued smoking.

Meanwhile, Terrence Winter, executive producer of "The Sopranos," smiled as he talked about the show's Emmy for best drama series. "The Sopranos" ended earlier this year.

Standing near his trophy, Winter said the HBO bash was for people "who truly loved each other."