AS INVESTORS STAND TO LOSE BILLIONS TIGER WOODS WAS OUT PARTYING IT UP WITH JUMPOFF NUMBER 1!

Is Tiger Woods shacking up with his No. 1 kitten?
The scandal-rocked pro golfer has been spotted in Palm Beach, Fla., with none other than alleged mistress No. 1, Rachel Uchitel, sources told Entertainment Tonight.

The reported sighting comes just weeks after Woods announced on Dec. 11 that he was taking a break from professional golf to "focus my attention on being a better husband, father and person."

Woods and Uchitel were rumored to be holding hands as they mixed with about 300 guests at a party in a private mansion in Palm Beach.

They were also spotted partying together in the ritzy enclave, at the Everglades Club, on Saturday night, Entertainment Tonight reports.

Some sources went even further, telling ET that the rumored paramours were living together aboard Woods' yacht, Privacy, which is reportedly docked in Palm Beach.

The Daily News reported last week that Uchitel, 34, had fled New York and was holed up in a $2 million Palm Beach pad on Sandpiper Drive, registered to 66-year old Michael Abtahi. It was unclear whether she was renting out the posh home or staying there under some other arrangement.

Her mother, socialite Susan Bishop, lives nearby, and the brunette party girl has been spotted around the neighborhood.

It was sexy text messages between Woods and Uchitel that reportedly sparked the initial confrontation between the golfer and his wife, Elin Nordegren.

Nordegren escaped to her native Sweden for the Christmas holiday with the couple's two children, their daughter Sam, 2, and Charlie, who'll turn 1 in February. In mid-December, Nordegren hired prominent divorce lawyer-to-the-stars Sorrell Trope, signaling she's likely to divorce her superstar hubby, who was named the Associated Press' athlete of the decade weeks after the scandal broke.

Woods has been linked to at least 10 other women with whom he's rumored to have had affairs.