EXCLUSIVE: Ashlee Simpson Introduces Boyfriend Evan Ross to Father Joe

Ashlee Simpson joined boyfriend Evan at his 25th birthday party in Malibu on Saturday.

Ashlee Simpson joined boyfriend Evan at his 25th birthday party in Malibu on Saturday.

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Ashlee Simpson's taking the next steps with boyfriend Evan Ross!

Life & Style can exclusively reveal that the 28-year-old introduced Evan to her father, Joe Simpson, at his 25th birthday party at the Revolve Beach House in Malibu on Saturday.

"Ashlee and Joe arrived around 3:30 p.m. Joe and Evan greeted one another with a hand shake," an eyewitness tells Life & Style. "It was a formal hello and looked like it was the first time they were meeting. Joe told him 'Happy Birthday.'"

EXCLUSIVE: Ashlee Simpson Is Thinking of Designing Her Own Clothing Line

And Evan's family seem to adore Ashlee, who's mom to 4-year-old son Bronx.

"Ashlee spotted his sister Tracee and ran across the room to give her a big hug and said how happy she was that Tracee came," the onlooker shares.

While guests noshed on yummy food, including pasta salad and chicken and waffles, Evan and Ashlee were inseparable.

"They were very touchy-feely — and right in front of Joe!" the eyewitness tells Life & Style. "Ashley was sitting on Evan's lap and at one point she leaned over and whispered in his ear. They disappeared from the group for a little bit. They were holding hands throughout the night and at one point, Ashlee came out out on the balcony asking the guests where Evan was. She wanted to be with him every second!"

Ashee Simpson Meets Evan Ross' Famous Mother, Diana

As Life & Style reported, the actor introduced Ash to his mom, Diana Ross, after her Aug. 3 show at the Hollywood Bowl. 

The duo were first spotted out and about in July and made their relationship public later that month.

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