It took Joe Jonas a little while to warm up at Beacher's Madhouse at the Hollywood Roosevelt Hotel, but once he did, the singer had a blast. Jonas arrived at 11:30 p.m. with some guy friends, and was quite amused every time a little person would fly to a table to deliver another bottle. He flirted politely with a few girls who approached his table, and even laughed when Jay-Z's "On to the Next One" – a song that pokes fun at Jonas and his brothers – came on in the club. After watching the Beacher's Babies burlesque dancers, he left at closing time.
– Jennifer Garcia

Kendra Wilkinson and hubby Hank Baskett stopped by a bash at Hollywood's Roosevelt Hotel, where they checked out Naven's holiday and spring 2012 swimsuit collections. Wilkinson, filming scenes for her reality show, browsed the collections while Baskett stood lovingly by her side. While chatting with guests, the proud mom gushed about baby Hank Jr.

Also catching the Beacher's Madhouse festivities: Paris Hilton, sans new beau Todd Phillips, who hung out with sister Nicky and pal Brandon Davis. Paris danced a bit, but was also focused on her BlackBerry, while her sister was more social. At one point, Nicky went over to talk to DiCaprio and Cooper.

Where's Blake? Leonardo DiCaprio added a new member to his posse – Bradley Cooper – during a night out at Beacher's Madhouse inside the Hollywood Roosevelt Hotel. The guys snuck into the club before 1 a.m. and took a seat in the front row for the vaudeville show. DiCaprio cheered for the burlesque performers and seemed more animated than usual. Grabbing Cooper's attention? The same troop of burlesque dancers.

New couple alert? Paris Hilton may have recently called things off with beau Cy Waits – and the heiress has been getting cozy with the Hangover director Todd Phillips. The two headed to Beacher's Madhouse, the vaudeville show inside the Hollywood Roosevelt Hotel, where they met up with Nicky Hilton and sat at a secluded table toward the back of the club. But the duo wasn't hiding their affection: they shared kisses and kept their eyes locked on each other despite the setting. Earlier, the two started their night at the Chateau Marmont, where they enjoyed wine on the patio with friends.

Also at Beacher's: newly minted Two and a Half Men star Ashton Kutcher, who sipped water in his roped-off section. The actor kept mostly to himself but seemed to really enjoy it when little people – strapped to harnesses – "flew" to tables to drop off bottles of alcohol.

Courteney Cox came out to support estranged hubby David Arquette at his Beacher's Madhouse bash inside the Hollywood Roosevelt Hotel – and the two spent plenty of time together. The Cougar Town star was one of the first guests to arrive, and took in the vaudeville show from the front row. At one point, Cox, who was sipping on vodka drinks, danced with Arquette on a ledge as she sang along to the music. Says an onlooker, "They looked so comfortable together – and like there was still a spark."

Bruce Willis had two lovely ladies by his side while celebrating his new movie, Red, at an afterparty inside the Hollywood Roosevelt Hotel: wife Emma and daughter Rumer. The actor was clearly the man of the hour though, and he worked the room and snapped pictures with guests. Emma, meanwhile, played the role of supportive wife, chilling out at her table with Rumer, who sipped champagne and looked radiant in her strapless black dress.

Leonardo DiCaprio and Charlize Theron were enjoying separate nights out when they saw each other hanging at Teddy's inside the Hollywood Roosevelt Hotel. The actress and her girlfriend were invited to join the Inception star and his pals at their table. According to an onlooker, the vibe was polite and sweet, and Theron introduced herself to the table with handshakes and hellos. Conversation flowed and everyone laughed, seemingly having a great time. Theron snuck out before other guests, though not before giving DiCaprio a hug goodbye.

Leonardo DiCaprio knew exactly where he wanted to sit during a recent night at Teddy's inside the Hollywood Roosevelt Hotel: At deejay Samantha Ronson's table. The actor sported his baseball cap, low over his eyes, and grabbed a seat in between three ladies. The Shutter Island star was handed drinks and acted very chatty as female clubgoers snapped his picture with their camera phones. Also at the nightspot: Shaun White, who celebrated his Olympic victory with a group of friends.