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Alec Baldwin, Hilaria Baldwin

DLM Press, PacificCoastNews.com

Alec Baldwin owes an apology to wife Hilaria.

While at the 2013 Cannes Film Festival photo call for his documentary Seduced and Abandoned today, the 55-year-old actor picked up his pregnant wife for a kiss and accidentally revealed her butt in the process!

Alec Baldwin, Hilaria Baldwin

Andreas Rentz/Getty Images

Judging by the disgruntled look on Hilaria's face, the PDA faux pas left her a little embarrassed.

Seconds before the bum-flashing however, the cute couple (and parents-to-be) were snapped sharing a sweet kiss outside the Palais des Festivals.

Alec and Hilaria's red carpet walk at the documentary's Cannes premiere the day before went a lot smoother. The lovebirds posed for pics with no wardrobe malfunctions in sight.