Holly Letchworth: Nick Lachey's New Girlfriend?

Nick Lachey‘s new “mystery blonde” is former University of Lousiana student Holly Letchworth.

The two were spotted leaving Stanley’s Restaurant And Bar on Sunday night in Sherman Oaks, Calif.

Radar is reporting that Holly‘s ex is another famous celeb, singer Jesse McCartney!

A source reveals, “Holly is a really beautiful and smart girl and Nick Lachey is a lucky guy. She couldn’t believe all the fuss and text[ed] me after their first date ‘I can’t believe they cannot figure out who I am?’”