Alessandra Ambrosio and Ashton Kutcher

Colcci Oficial via Facebook

There's some cheating going on in Ashton Kutcher's surprise new ad campaign with model Alessandra Ambrosio for Brazilian sportswear brand Colcci.

The "No Strings Attached" actor, who was a print and runway model before "That '70s Show" and Demi Moore changed his handsome profile, engages in some sexy naval gazing with the Victoria's Secret Angel in the pictorial shot by Steven Klein.

The pictures of the denim-clad duo, which are now featured on the brand's Facebook page and blog, are part of Colcci's Fall 2011 ad campaign.

Alessandra Ambrosio

Colcci Oficial via Facebook

Meanwhile, Ambrosio's mugging for the fashion label means Colcci's no longer being completely exclusive with fellow Brazilian it girl, Gisele Bundchen.

Mrs. Tom Brady did the brand's 2010 ad campaign, strutting its Sao Paolo Fashion Week runway scant weeks after giving birth to son, Benjamin Brady.

Kutcher's pics, which feature him squatting solo poolside in a denim shirt and jeans, and staring down on a supine Ambrosio's semi-nude abdominals, seem a little, ahem, punk'd after all of 2010's stepping-out-on-Moore rumors.

Ashton Kutcher

Colcci Oficial via Facebook

The campaign also explains why Kutcher, accompanied to Brazil by his famous wife, made a surprise appearance on the Colcci runway last month.

Of course, Kutcher is not the only family member fronting a fashion label: His stepdaughter, Rumer Willis, recently posed for Badgley Mischka.

And check out how 48-year-old Mrs. Kutcher looks in a bikini.