Britney Spears Parties on New Year eve, Collapses

Photo Bruce Gifford/FilmMagic

Britney Spears was spotted 'getting busy' with Arizona Cardinals quarterback Matt Leinart on Friday night while she was partying over the New Years Holiday weekend.

The couple was seen getting it on at the popular Arizona club called the 'Jackrabbit Lounge.'

According to reports, the pair were flirting hardcore on the patio area all night long, bumping and grinding and whispering in each others' ears.

On Monday morning, less than one hour into the New Year, Spears collapsed at the "Pure" nightclub inside Caesars Palace. Only 50 minutes earlier, she danced for the crowd to her song I'm A Slave For You and did not one but two countdowns - one outside and one inside. Inside the club she yelled "What happens in Vegas always stays in Vegas" and after the countdown she wished everybody a Happy New Year.

Britney had reportedly been seated on a cabana bed overlooking the dance floor at 12:50AM talking with one of her male dancers, reports Vegas Pop. She indicated that she wanted to leave and as she stood up, "she went into a dead faint and just fell right to the floor."

Security and two of her dancers reportedly wrapped Britney in what looked like a blanket-hooded poncho and carried her out of the club.

It appeared as if "she was being dragged as she wasn't walking under her own speed" said one eyewitness. "It looked as if they wanted to get her up to her hotel room as soon as possible."

Vegas Pop reports that at 2am this morning, an ambulance was summoned to the hotel but it was unclear at this time if it was brought to Caesars for Spears.