Russo kissed Bieber passionately in the music video of his track All That Matters, reports contactmusic.com.
"In the beginning it was kind of weird because I had never kissed anyone on set that passionately or that famous - kissing him was nice," said Russo.
"I got butterflies and I do still to this day. After the shoot wrapped it felt so surreal, I even got a speeding ticket after because I was on such a high. I guess you could say I wouldn't mind doing it again," she added.