Austin Mahone and Camila Cabello were reportedly reunited.

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According to a report, Hailee Steinfeld celebrated her 18th birthday party presented by Juicy Couture Black Label and The Coveteur with food from Hyde Sunset Kitchen + Cocktails in Los Angeles. In attendance at the bash were Mahone and several members of Fifth Harmony, including Cabello and Ally Brooke.

"Austin was with a group of friends, but not one girl in particular," a source told E! News on Saturday. "He was very sweet to all the ladies at the party."

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After touring together for several months, Mahone and Cabello began dating in August of this year. For weeks, the pair appeared to be head-over-heels in love. They even shared a handful of photos of one another on social media. Then, last month, just weeks after confirming the relationship for the first time, Mahone and Cabello called it quits.

Although it is unclear whether Mahone and Cabello spent any time together at Seinfeld's birthday bash, Mahone did take time out for her band mate, Brooke, with whom he posed for an Instagram photo. "Three amigos," Mahone captioned the pic, which also featured another male.

While Mahone and Cabello both shared photos of themselves at the party, they did not share any photos of one another.

Other guests at the party included actresses Sarah Hyland, Debby Ryan, Odeya Rush and Bailee Madison.

Tags: camila cabello austin mahone Hailee Steinfeld