Diddy’s sea and do

SEAN Combs set sail with longtime girlfriend Cassie as well his ex, Sarah Chapman, in celebration of his and Chapman’s 11-year-old daughter Chance’s birthday on Sunday. The extended family was on the Mediterranean, off Capri, Italy, and Combs posted a video pronouncing a “Hi five for co-parenting! . . . Sarah you did an excellent job. Co-parent- ing let’s go, life is too short.” Cassie posted a photo with Combs with a caption reading “thankful.” Hip-hop mogul Diddy has been reportedly renting a vessel named Double Down for a cool $560,000 a week. Back in 2014, he took another ex, Kim Porter — the mother of three of his kids and a son he adopted — on vacation in St. Barts on a $72 million yacht named Oasis.