Thank you for being you. I love you with all my heart. Happy 17th Birthday!!!" the proud dad, 49, wrote. Cox also raved about her daughter's self-expression last month on The Drew Barrymore Show.

The reality star wished her daughter a happy 17th birthday ... wrote a sweet tribute in honor of Ariana’s 17th birthday. “Happy Birthday to my angel @arianabiermann 17 on the 17th!!

RHOBH daughter Alexia Umansky celebrates Portia Umansky's 17th birthday. Photo: Alexia Umansky/Instagram “Happy birthday to my twin who just happened to be born just a couple (12) years later ...