Model Cara Delevingne seems to have mediated between her mutual gal pals, frenemies Kendall Jenner and Selena Gomez, as the trio were seen celebrating Jenner's birthday in Los Angeles on Sunday night.

Jenner and Gomez, who were once extremely close, were reportedly going through a rough patch when the "Keeping Up with the Kardashians" beauty was spotted having what seemed like a romantic dinner with pop brat Justin Bieber, Gomez' on-again, off-again love.

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Rumor has it that Bieber was hanging out with Jenner behind Gomez's back.

But all seemed well over the weekend as Delevingne took to Instagram to post a video of herself and Gomez taking to the microphone to sing their own rendition of "Happy Birthday" to Jenner who turned 19 on Monday.

Although the clip was short, the three were in obviously great spirits as the two belted out the tune, with Gomez stumbling over some of the lyrics at a certain point. Jenner, on the other hand, looked happy and somewhat embarrassed as a friend took a video of her listening to the song and blowing out candles on her cake.

Other girls were also at the celebration and joined in on the fun. The jovial video then ends with Jenner running to her friends and sharing a group hug with Gomez, Delevingne and the other others.

In April this year, Bieber, Gomez, Kylie and Kendall Jenner were spotted having a great time at the Coachella Valley Music And Arts Festival.

However, soon after the event, Gomez decided to unfollow the two Jenners on social media after reports were released that Kylie had hooked up with Bieber during the three-day music event.

Gomez and Delevingne, on the other hand, forged a strong friendship last July as the the duo celebrated Gomez's 22^nd birthday at St. Tropez.

Now that Bieber seems to be out of the picture yet again, Gomez seems to be rekindling friendships with former girlfriends.

TagsSelena Gomez, Cara Delevingne, Kendall Jenner