What Nick Lachey ever saw in Jessica Simpson remains a mystery.

But the identity of the blonde beauty the singer was spotted with over the weekend has at least been revealed: say hello to Holly Letchworth.

Radar Online spoke to a friend of the 23-year old bartender, who confirmed that her pal and Lachey had a date at Stanley’s Restaurant and Bar on Sunday night in Sherman Oaks, California.

“Holly is a really beautiful and smart girl and Nick Lachey is a lucky guy," the source said, adding that Letchworth actually had a recent fling with singer Jesse McCartney.

Lachey ended a longtime relationship with Vanessa Minnillo last month - but that just makes him and Holly an ideal match, her anonymous friend added.

"Her last boyfriend broke her heart, so she is not looking to settle down and she is having fun hitting bars and in Los Angeles right now," said the insider.

Can this acquaintance envision Nick and Holly having a future together? 

“I think they are very well suited because he seems like he is a good guy and they are both currently single and available right now,” she said.

That's pretty much all Jillian Harris and Ed Swiderski had in common when they got engaged, so you never know where this relationship is headed!