Ariana Grande was spotted enjoying a night out with One Direction heartthrob Niall Horan in England this week.

According to The Mirror, Horan watched Grande successfully perform in front of 20,000 fans at the O2 Arena on Monday evening -- her first U.K. date for "The Honeymoon" world tour. The two met each other backstage.

Shortly after her sold-out gig, the "One Last Time" singer headed to central London's burlesque club Cirque le Soir with a small entourage of pals. The 1D member then joined her, and they partied together until early Tuesday morning.

The couple left separately just before 3 a.m., seemingly interrupted by three fire engines called to the venue due to an electrical fault.

Grande took to her Instagram account on June 2 to share a video clip of herself inhaling helium gas from a balloon and giggling with Horan and her friends.

 new friends + old friends + helium balloons @lexie1225 @alfredoflores @niallhoran @chantelgonsalves

A video posted by Ariana Grande (@arianagrande) on Jun 2, 2015 at 6:29am PDT

Meanwhile, the "Problem" hitmaker's ex-boyfriend Big Sean might be regretting their split in April.

On May 30, the "Blessings" rapper Instagrammed a cryptic message that read, "Sometimes I close my eyes n pretend it's just me n u," along with a snapshot of himself singing.

Sometimes I close my eyes n pretend it's just me n u A photo posted by BIGSEAN (@bigsean) on May 29, 2015 at 5:04pm PDT

However, Grande is rumored to have moved on from the recent breakup with her "Scream Queens" co-star, Diego Boneta.

When asked about a potential romance between him and the "Break Free" crooner, the Mexican actor kept his answer indirect.

"I'm going to tell you that I love that we are in the series together," he told El Mundo. "And that's where I'm going to leave it."