Ashlee Simpson Parties with Boyfriend Evan Ross's Family

Ashlee Simpson Parties with Boyfriend Evan Ross's Family
Evan and Ashlee in N.Y.C.
Jamie McCarthy/Getty

08/05/2013 AT 08:00 PM EDT

Family approval? Check!

Ashlee Simpson joined boyfriend Evan Ross at his mother Diana Ross's Los Angeles concert after-party at Hollywood hotspot Aventine Trattoria, where the new couple was spotted "dancing and kissing" throughout the night.

"She was nice and said hello to Diana," says a source. "Everyone was in a good mood and Ashlee just blended in as Diana's son's girlfriend."

Later in the evening, Simpson spent some time bonding with Ross's sisters while he ordered a special plate of food just for her.

"[Ashlee] was talking about traveling soon with Evan," adds the source. "They were very affectionate."

While Diana Ross played hostess until midnight, the new couple partied until 1:45 a.m., leaving the venue together.

– Melody Chiu

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