Harry Styles and Zöe Kravitz grab each other’s butts during PDA-packed outing in Rome

Zöe Kravitz and Harry Styles turned up the heat on their apparent romance with a butt-grabbing outing.

In photos, the “Watermelon Sugar” hitmaker stepped out with the “Blink Twice” actress in Rome on Friday while holding hands and chatting. In one photo, the singer grabbed Kravitz’s rear, and in another snap, she casually returned the favor during their affectionate walk.

For the sunny outing, Kravitz, 36, wore a black, lace-lined slip dress with red ballerina flats. She accessorized with sunglasses and carried a straw handbag, and styled her voluminous waves around her shoulders.

Styles, 31, rocked jeans and a white T-shirt with sneakers, slinging a denim jacket over his shoulder and donning a pair of sunglasses.

Reps for Styles and Kravitz did not immediately return Page Six’s requests for comment.

The pair was previously seen heading out of New York City’s JFK airport on Thursday.

Sources told Page Six earlier this month that the One Direction alum and “Big Little Lies” actress are enjoying more than a passing fling. “I feel like they’ve gone from 0 to 60,” a Hollywood insider told us.

“It’s so hard to date as a celebrity … Harry wouldn’t have gone public with Zoë if it wasn’t anything,” a music source said. “[But] it’s very new and fresh and they’re just having fun.”

However, they added, “Harry doesn’t label this stuff.” The source explained, “This is the happiest Harry has ever been, he’s just having a great time.”

While his apparent romance with Kravitz has drawn high-profile attention, a friend of the “Kiss You” singer said he wants to live a low key life.

“He wants to be as normal as possible,” they said. “He would walk around Brooklyn all day [incognito] if he could, but that’s not the lifestyle he leads.”

The music heartthrob and actress first sparked dating speculation in August, when a video of the duo stepping out in Rome went viral — even as rumors Kravitz could be involved with her “Blink Twice” co-star Austin Butler proliferated.

A source for the Sun claimed to have seen Styles and Kravitz making out in London, also in August. “Harry and Zoe were tucked away in a corner in Rita’s and were snogging like teenagers,” the source divulged to the outlet, adding, “They seemed really into each other.”

Early in September, the couple seemingly confirmed the romance when they were seen by a Page Six spy holding hands in Brooklyn.

“He was making some joke. He leaned his head back, looked up and she was laughing,” they said, adding that Kravitz and Styles “are definitely a couple.”