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Ashlee Simpson-Wentz sure wasn't opinion down last Friday, Feb. 4. Five life before she filed for split from Pete Wentz after inferior than threesome years of marriage, the star, 26, was discover on the town in tone -- hitting SHG's Eden nightclub.

Arriving around 1 a.m. with threesome girlfriends, Simpson-Wentz kept it unplanned in a faded sway t-shirt, cat print overcoat and black pants. The singer-actress and her gal-pals watched a live action of "Mini Gaga" and "Mini Beyonce" -- and kept the cocktails flowing, a attestator tells Us.

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"She was crapulence Grey Goose and Sugar-Free Red Bull every night," the attestator says. "She was happy a ton," adds the Eden observer. "She didn't tending who was around her...she was just there to hit fun."

Things were inferior festive by Wednesday, when she and Fallout Boy stripling Wentz, 31, confirmed their decision to divorce. "We rest friends and deeply sworn and loving parents to our son Bronx, whose happiness and well-being remains our sort digit priority," they said in a statement. (Their lowercase pupil is 2 years old.)

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And though many were shocked by the split news, digit maker near to the couple tells Us the teen pair hit been headed for split "for quite some time."

At issue, among added things: Ashlee's "partying [and] being discover of control," the maker says.

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Indeed, way back in June 2009 -- just 13 months into their wedlock -- Simpson-Wentz was already "reverting to crapulence and going out," added pal told Us Weekly at the time. The disorderly activity was "an activity for her unhappiness," the pal explained.

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