If the trailer's a rockin' ...

With a tour on the horizon, the New Kids on the Block were all hard at work on their new video shoot this weekend.

Also in L.A.: Wynona Ryder hid her face, Shirley MacLaine got lost, 65-year-old Joe Pesci partied at Villa, Mary Carey talked about breaking sobriety and Steven Tyler heard the most tired joke ever.

In NY: Will Smith continued campaigning for Nicest Man Alive, fans tested Selma Blair's patience and Ryan Gosling walked his dog ... no, not Kirsten Dunst.

Sly Stallone is still the man, and he proved it yesterday.

He patiently went toe to toe with mobs of fans in Hollywood at last night's premiere of "Rocky Balboa," signing autographs and smiling for photogs. Thirty years since Rocky first stepped into the ring, the Italian Stallion proved he's still a knockout.

Also showing up for the premiere: Three 6 Mafia walked by in a Steel City cap, James Caan, and Jason Hervey of "The Wonder Years." Benjamin McKenzie showed his face, along with handsome "Rocky" co-star Milo Ventimiglia, who scribbled his name for fans.

Also out for the night: former teen idol Frankie Avalon, and the most politically incorrect man we know; Bill Maher, along with a guy anyone would want in their corner -- Paulie (aka Burt Young) himself!

Check it out in today's Star Catcher.