We hear . . .

That Mariah Carey and Nick Cannon will be honored at Russell Simmons’ Art for Life Gala at his East Hampton home today, followed by a party at the Hamptons Players Club . . . That fashion line Ruffian designed “pet owner collars” for a Southampton Animal Shelter Foundation benefit today at Sequin . . . That tune-spinning duo the Chainsmokers signed to DJ Jus-Ske’s 4AM management firm . . . That Dutch pop artist Hayo Sol, whose fans include Prince Albert of Monaco, exhibited his works at Pink Elephant Thursday.