They reignited romance rumors when they were spotted enjoying a cozy night out together earlier this week.
And Niall Horan's new love interest, model Jessica Serfaty, 25, set pulses racing as she posed in a sexy swimwear shoot for Swedish brand, Chiquelle x.
Displaying her peachy posterior and toned figure in all its glory, the mother-of-one dazzled in a series of scorching shots.
In one image, the former Victoria's Secret beauty flashed a glimpse of sideboob in a racy nude one-piece, which featured an 80s-style high brief cut to put her delectable derriere on show.
The catwalk queen showcased her washboard abs in blush bikini, before setting pulses racing in a sexy black semi-sheer two-piece.
Smoldering into the lens, Jessica wore her light brunette locks in beachy waves and accentuated her stunning features with low-key make-up.
Jessica and Niall, 23, were first linked back in March, but the couple set tongues wagging once again this week when they were pictured heading to a gig in Los Angeles.