The 28-year-old actress discussed the 21-year-old singer in an interview with Sway in the Morning this week. Bieber is well-known for hosting often disruptive get-togethers, and Rossum told host Sway she is too old for the pop star's parties anyway.
"Justin Bieber just moved into the house next door to me," she revealed. "He's my new next door neighbor and I went over to offer him a neighborly hello and I'm not going to do that again. He has a ton of bodyguards there and they're really scary."