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<p><span>that the singer wonders whether Russell really was the "changed man" he claimed to be when the two married in 2010</a>. "I'm such a fool," Katy recently confessed to a pal. "I believed in him."</p>
Now Katy is leaning on her friends for support -- and even enjoyed a late night out with pals (including a bevy of men) in the early morning hours of Feb. 23.
"Katy was partying with a bunch of pals at the Spare Room at the Roosevelt Hotel in LA," an eyewitness tells Life & Style. "She came in around 1:30 a.m. She was wearing a gray sweatshirt and sweatpants with blue high pumps."
Though the place normally closes by 2 a.m., it stayed open later for Katy and her crew.
"She was also with a bunch of male friends, and they played numerous games of bowling," the eyewitness reveals to Life & Style. "They were drinking mixed vodka drinks and having a blast!"
And the 27-year-old singer seemed to enjoy getting away from all the chaos that's been surrounding her lately.
"It was obvious that she liked being out and having a fun, carefree time, without crowds of people around her," the eyewitness tells Life & Style.
"She was all laughs and smiles with her friends," the eyewitness adds. "Security left at 2:15 a.m., but Katy stayed behind with her pals and continued the party."
In early February, a judge signed a divorce judgment, effectively ending Katy and Russell's 14-month marriage. The divorce officially takes effect in July in compliance with California law, which requires at least a six-month waiting period between filing and the final decree.