Camila Cabello Tells Shawn Mendes 'I Love You' in Sweet Birthday Message: See Their Kiss!

The 22-year-old pop star is gushing over her rumored beau.

Camila Cabello is celebrating Shawn Mendes' birthday!

On Friday, the 22-year-old singer took to Instagram to share a throwback Polaroid pic of her and Mendes in honor of his 21st birthday. In the silly snap, Cabello is smiling as Mendes plays with her hand.

"Happy birthday to this magic human, I love you!!!!❤️❤️❤️❤️," she gushed in the caption of her rumored beau.

The sweet post comes one day after an eyewitness told ET that Mendes celebrated the milestone occasion in New York, where he rented out Harriet's Rooftop & Lounge at 1 Hotel Brooklyn Bridge.

The bash got underway around 10 p.m., with the attendees singing the birthday boy "Happy Birthday" as he was presented with a cake, which featured replicas of the essential items found in his dressing room on tour, the eyewitness said.

Shawn Mendes

Mendes appeared to have fun at the party, as he told his guests that he was too drunk to give a speech after they sang to him. According to the eyewitness, Cabello stuck by Mendes' side for much of the party -- which also included beer pong and dancing -- before the two shared a steamy kiss and the party wrapped up around 2 a.m.

The birthday festivities are the latest in a string of PDA outings for the "Senorita" singers. Last month, a source told ET that Cabello and Mendes are "committed to working on a relationship."

"Shawn and Camila originally were just enjoying spending time together and having a summer fling," the source said. "Camila had just got out of a relationship and Shawn was in the middle of a massive tour."

"However, Shawn and Camila have really fallen for one another," the source added, noting that the former Fifth Harmony star has been traveling with Mendes throughout his tour.

Watch the video below for more on the duo.

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