Ashlee Simpson enjoys dinner date with boyfriend Evan Ross... after getting 'seal of approval' from his famous mom Diana

He's my man: Ashlee grabs hold of boyfriend Evan Ross

Meeting the parents for the first time is often a daunting experience and when your boyfriend's mother is music legend Diana Ross, that initial introduction must be more than a little intimidating.

But Ashlee Simpson needn't have worried - it seems that she has already got the famous family's seal of approval.

And to celebrate, she and her new beau Evan Ross hit the town for a romantic dinner date on Tuesday night.

The couple, who began dating just last month, enjoyed a bite to eat at the Aventine Restaurant in Hollywood.

Dressed in matching black leather jackets, they looked a perfect match for one another.

Cause for celebration: Ashlee has been accepted by Evan's famous mother Diana Ross

Singer Ashlee, 28, who divorced rocker Peter Wentz in 2011, is said to be smitten with actor/musician Evan who is four years her junior.

On Saturday, the new couple attended a party for Diana, 69, at the same Hollywood eaterie.

The Supremes singer was celebrating with family after her sell-out performance with the LA Philharmonic at the Hollywood Bowl.

Ashlee - who attended the concert - was said to be understandably nervous about the encounter.

Legend: Singer Diana Ross met with her son Evan's new girlfriend Ashlee Simpson

But according to the New York Post's Page Six, she needn't have worried.

The newspaper said a fellow guest overheard Ashlee saying that she was 'nervous . . . but Diana is wonderful and very open.'

Others described Diana's youngest son and his girlfriend looking happy and relaxed.

They were spotted dancing and kissing and even heard discussing plans to travel to Europe together.

Evan pictured in New York in July not long after they began dating

An onlooker who overheard the couple's conversation told People.com: 'Ashlee was talking about traveling soon with Evan. They were very affectionate.'

The source also revealed: 'She was nice and said hello to Diana. Everyone was in a good mood and Ashlee just blended in as Diana's son's girlfriend.'

Pretty pair: Ashlee and Travel plans: the pair are thought to be planning a vacation together