Paris Hilton Parties at L.A. Club After Breakup

See who else is single this fall.

The 27-year-old heiress met up with her pals from her reality show, My New BFF, at 12:52 Thursday morning.

After just five minutes, Hilton - who donned a black knee-length dress, curled hair and fishnet stockings - left their VIP booth to head outside to make phone calls, according to an eyewitness.

"Once she got off the phone, she went back inside and immediately put on an act like she was having a good time," an onlooker tells Usmagazine.com.

"Her friends were trying to talk to her, and it looked like she was making an effort to talk with all of them even though you could tell she didn't feel like partying," the witness adds.

Between texting, her BFFs tried to get her to dance.

"She was laughing, but looked like she was too embarrassed to dance," the witness says. After about a minute of half-heartedly hitting the floor, Hilton hugged her pal, Onch, and headed off to the bathroom by herself.

See how Paris normally dances at clubs.

Hilton blew her pals a kiss and headed out just 30 minutes after arriving.

"She definitely didn't seem like her usual party girl self tonight," the witness says. "[She was] way more reserved and distracted, like her mind was elsewhere. She was trying very hard to appear carefree, but it was clear she didn't want to be there and was waiting for the right moment to make her exit."

Meanwhile, an unsmiling Madden, 29, briefly hit up Bardot, a Hollywood club.

On Wednesday, Hilton's rep confirmed to Us exclusively that the heiress and Madden, 29, called it quits after nine months of dating.

"Even though they are still in love, they felt it would be better to just be friends," a source close to Hilton tells Us.

Check out photos of star BFFs.

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