Amanda Bynes loosened tensions in the Crown Bar in West Hollywood on Oct. 22 when she and several girlfriends bopped around the dance floor and sang along to songs from the hit film “Grease.” The stunning actress was a huge hit with onlookers when she danced and sang along to Olivia Newton John and John Travolta’s classic duet “You’re the One That I Want.”

Funnyman Seth Rogan had pals in stitches when he did a Michael Jackson-style robot dance and moonwalk at the Roosevelt Hotel in Hollywood on Oct. 20. When the “Knocked Up” star left his sexy brunette date to use the restroom, Seth got lost in a maze of nooks and hallways, but was rescued by a hotel staffer.

Seth’s “Zack and Miri Make a Porno” co-star Justin Long was also at the Roosevelt, but barely acknowledged Seth. Justin brushed by Seth and his entourage to say hello, but quickly made a break for the door looking very annoyed.

Notorious skirt-chaser Jared Leto showed up at Foxtail in West Hollywood on Oct. 21 for a burlesque-themed party brimming with girls in skimpy outfits. The “Chapter 27″ star, with hair slicked back in a ponytail, wasn’t shy about grabbing one girl’s plastic whip and giving her a firm smack across the butt. That’s some pickup technique you got there, Jared!