Camila Cabello & Shawn Mendes Share A Steamy Kiss At His Birthday Party

Shawn Mendes' 21st birthday was sealed with a special kiss from his longtime friend and rumored girlfriend Camila Cabello.

While celebrating the "If I Can't Have You" singer's milestone on Thursday (August 8) in NYC, the rumored couple was filmed sharing a passionate kiss that sent the Mendes Army and Camilizers into a social media tailspin. (See the steamy moment HERE)

"Shawn held a party last night for his closest group of friends. It was very low key but he did get loose with his friends," a source told E! News of the rooftop celebration. "Shawn and Camila arrived together holding hands and everyone inside cheered for them as they walked in."

"There were several beer pong tables set up that all said 'SM21' on them with matching 'SM21' pong balls," the insider added. "Shawn was having fun playing beer pong with his friends and had a smile on his face the entire night. Camila was by his side the majority of the night and they looked really cute together. They took photos together and were on the beer pong table together at one point. Camila also planted a huge kiss on Shawn during the night and it was super cute."

A day after the celebration, Camila declared her love for her alleged boo in a heartfelt Instagram post. "Happy birthday to this magic human, I love you!!!!❤️❤️❤️❤️" she captioned a throwback photo of the two.

Despite their numerous public displays of affection as of late, neither Camila or Shawn has confirmed if they are, in fact, in a relationship. As fans know, dating rumors have long plagued the twosome. However, they were heightened last month after the release of the music video for their hot and sexy duet "Señorita." In the days and weeks since, the two have been spotted going on multiple romantic dates that included full-blown makeout sessions.

Photo: Getty Images