PARTY PEOPLE: DIDDY, CASSIE, NICKI MINAJ, BIG SEAN & MORE KICK IT IN VEGAS FOR MEMORIAL DAY WEEKEND.

 Celebs hit up Las Vegas to bring in their holiday with a huge Memorial Day bash! Peep the pics of Diddy, Cassie, Nicki Minaj, Big Sean, Meek Mill, Nick “Swaggy P” Young and his girlfriend Iggy Azalea ...

Yesterday, Diddy bought the party to Rehab Pool at the Hard Rock Hotel and Casino in Las Vegas and he also brought along his boo Cassie.

 The couple partied it up with unlimited amounts of Ciroc and celebs Nicki Minaj, Meek Mill, Big Sean, L.A. Lakers baller Nick “Swaggy P” Young and his rapping girlfriend Iggy Azalea.