Robin Thicke reportedly splashed out $2,800 on sexy Halloween costumes for four women.

News that the 'Blurred Lines' hitmaker is splashing the cash on his female friends comes just weeks after his estranged wife Paula Patton, with whom he has four-year-old son Julian, filed for divorce on October 3.

The hunky singer even threw a wild party on October 10 to celebrate his newly single status after spending months trying to work things out with his former love.

Robin held the divorce party at a night club in Los Angeles before moving on to his home in the Hollywood Hills, where he was joined by Hollywood hunk Leonardo DiCaprio and lots of attractive models.

A source said previously: "There were a lot of models there. Leo and Robin were being super flirtatious and talking to tons of girls.

"Robin was dancing and talking to a pretty brunette throughout most of the night. At one point, he grabbed a girl's hand and was like, 'Let's dance.' "

Paula called time on their 21-year relationship - nine of which they have been married - in February.

However, shortly after their split, Robin dedicated his seventh studio album, 'Paula' to his estranged wife in a failed bid to win her back.