Demi Moore Spends Wild Night Out Pre-Treatment

Demi Moore and Rumer Willis

National Photo Group

updated 01/24/2012 AT 8:50 PM ET

originally published 01/25/2012 AT 8:45 AM ET

Less than two weeks before seeking treatment for exhaustion, Demi Moore spent a late night out in Hollywood with her 23-year-old daughter Rumer Willis.

Wearing a short black skirt and striped sweater, the actress, 49, arrived at Beacher’s Madhouse at The Roosevelt Hotel just after 11 p.m. on Jan. 11.

“When she first arrived, she kept to herself … but she started loosening up and getting into party mode,” an onlooker tells PEOPLE about Moore, who sipped Red Bull at the hot spot. “She seemed really happy to be out with her daughter’s friends.”

Though she was not seen downing any alcohol, Moore, who split from husband Ashton Kutcher, 33, last November, appeared to be lapping up male attention – especially from 90210 actor Ryan Rottman.

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