The summer sun wasn't the only thing that was sizzling on the stony shores of Amalfi. Actor Bradley Cooper and his supermodel girlfriend Irina Shayk were engaged in some heavy PDA and shared more than a few steamy kisses while on vacation in the Italy, the Daily Mail reported.

Cooper, 40, wore bright orange men's swim trunks while soaking up the rays and reportedly couldn't keep his hands off of his 29-year-old Russian girlfriend. The couple seemed like they were completely oblivious to the outside world as they shared a relaxing day together.

Shayk wore a mismatched orange pipeline thong bikini bottom with a light turquoise-blue bikini top. She alternated wearing her wet hair loose and in a mid-height ponytail and propped a pair of sunglasses on top of her head.

They first were linked as a couple in May, according to E! News, after Cooper and Shayk were photographed holding hands and kissing while on a New York City stroll. Cooper had just broken up with his ex-girlfriend, 22-year-old English model and actress Suki Waterhouse, just two months prior to his outing with Shayk.

Shayk previously dated Cristiano Ronaldo, the Portuguese soccer star who plays with the Spanish club Real Madrid, according to NESN. Shayk and Ronaldo called it quits in January after spending five years together.

Cooper and Shayk moved on quickly from their respective previous relationships. They met at the Met Gala after-party in May and a source close to the couple said they're happy with the way things are going in their current relationship.

"Things are really heating up and they are growing very, very close while getting to know each other," a source told E! News last month. "Everyone that is close to the couple really thinks this is it for the two of them."

See the couple's steamy beach kiss below.