He's officially moved on from Bachelorette Ali Fedotowsky!

Life & Style can exclusively reveal that Roberto Martinez, 29, has revved up a romance with Playboy playmate Sara Underwood, 29.

"They're serious," an insider tells Life & Style. "He couldn't be happier with Sara."

After getting engaged on The Bachelorette in 2010, Ali and Roberto split in November 2011. But it wasn't over for good. As Life & Style initially reported, the exes reignited their flame while attending Ashley Hebert and J.P. Rosenbaum's nuptials this past December. At the time, a source exclusively said the pair "hooked up after the rehearsal dinner." It now seems, the past is the past.

EXCLUSIVE: Bachelorette Ali Fedotowsky's hot hookup with Roberto Martinez

Now the insider insists Roberto has put everything with Ali behind him. "Sara is nothing like Ali," says the source.

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Roberto and Ali didn't get their happily ever after meeting on The Bachelorette, and now Life & Style reports in this week's issue — on stands now — that the future isn't looking too bright for the newest couple of the franchise, Sean Lowe and Catherine Giudici.

EXCLUSIVE: The Bachelor's Sean Lowe and fiancée Catherine Giudici: 2 fights in 2 days

For more inside the Bachelor world's latest relationship drama, pick up the new issue of Life & Style, on stands now!