Partying mama Britney Spears is sporting a new sidekick, and we’ll give you a hint:

He looks less like a blonde heiress than a certain baby daddy.

Isaac Cohen, 25 (who calls himself “Eyezik” on his MySpace page), is a chisled, C-List actor-model sporting the same 5 o’clock shadow, baggy low-slung pants, occasional kercheif, and signature buzz cut of her previous paramours Kevin Federline and Justin Timberlake. The Encino, Calif., Jewish model also sports plenty of temporary tattoos for the catwalk (according to various D-list media blogs).

Just when you thought Justin & Brit Part 2 had a chance, the new couple’s already getting snapped in sunny vacation photos. Eyezik’s L.A. Model rep is confirming the romance (can you say desperate for an image upgrade??!).

One thing that stands out, according to news reports, is that Eyezik’s not naughty and materialistic. He’s just a genuinely nice dude.

That’ll fare well in Brit’s upcoming sole-custody battle (you thought we’d forgotten about those kids, didn’t you?) with K-Fed. My advice for Brit: Spend less time lounging around and more time getting to know your children. Sure, they’re not as exciting as champagne-drenched Vegas on New Years, but once you’re a mom, partying comes second.