"It looks like things are getting serious between Ashlee Simpson and Evan Ross! Although they just made their official debut as a couple last month, the twosome's relationship appears to be on the fast track as they both have met each others families. Earlier this week, a smiling Simpson was photographed strolling around Venice Beach, California, with Evan and her 4-year-old son, Bronx. The trio held hands while sporting rock 'n' roll T-shirts. Last weekend, Ashlee, 28, apparently also received the approval of her 24-year-old beau's mom, Diana Ross. Simpson attended Ross's Los Angeles concert afterparty at Aventine Trattoria in Hollywood. "She was nice and said hello to Diana," a source told People magazine. "Everyone was in a good mood and Ashlee just blended in as Diana's son's girlfriend." So is this just a summer fling, or could it be the real thing? "They are both really happy together," a source close to the couple tells omg!. "They were friends first so they had a great foundation already to build on." Adds a second insider: "They are really comfortable around one another. It's cute!" They certainly look like a great fit!"