Paris Hilton headed off to Sin City to party.

Sexy and single, Paris Hilton headed off to Sin City to party the weekend away at the Hard Rock Hotel Casino in Las Vegas on Sunday (April 25).

Clad in a blindingly bright pink bikini, the hotel heiress was joined by her sister Nicky to host Rehab - which dubbed itself as The Ultimate Daytime Pool Party.

Keeping her fans and followers up-to-date the whole way through, Miss Hilton tweeted just prior to the event, "Walking thru the casino right now to my pool party! See you all in a few xoxo Paris ;)"

Having a marvelous time, the 29-year-old later wrote, "Today was so much fun! Do you like my hot pink bikini? ;)"

The Vegas trip comes just after Paris kicked off the weekend dining out with ex-fiance Jason Shaw, which comes shortly after she announced her split from Doug Reinhardt.