VIDEO : Sylvester Stallone's Daughters Gush Over Latest Magazine Cover

Sylvester Stallone's daughters recently opened up to ET about their latest gig at the Harper's Bazaar's magazine party in Los Angeles on Thursday. Sophia, 20, Sistine, 18, and Scarlet, 14, recently rocked the cover of Harper's Bazaar's May issue. "I'm still in shock," Sistine revealed. "I think we're all still really in shock from this moment because when we actually found out that we got the Harper's Bazaar cover, it was the three of us." "We thought it would stop at the Hollywood Reporter," Sophia explained. "And then all of a sudden they were like, 'Oh, Harper's Bazaar is here.'"