Credit: Most Wanted Pictures

So long, six-pack!

Mark Wahlberg -- who famously flashed washboard abs in those 90s Calvin Klein ads -- has packed out a few extra pounds.

See stars who went from hunk to chunk!

The actor's paunch appears to be for a role in the upcoming boxing drama The Fighter, which he filmed Monday in Los Angeles.

Wahlberg, 38, plays Boston fighter "Irish" Mickey Ward who reached the world lightweight championship with the help of his half-brother Dicky Eklund (Christian Bale).