Sofia Richie dances to Justin Bieber song on social media amid Selena Gomez feud

Justin Bieber's teenage girlfriend Sofia Richie took to social media on Tuesday (16Aug16) to show support for her boyfriend following his feud with his ex-girlfriend Selena Gomez.

The former lovers fell out on social media after Selena took aim at the Baby singer for threatening to quit Instagram over vile remarks made about his new girl, Lionel Richie's 17-year-old daughter.

In a now-deleted post, Selena shot back, "If you can't handle the hate then stop posting pictures of your girlfriend lol - it should be special between you two only. Don't be mad at your fans. They love you. They were there for you before anyone."

The comment riled her ex, who fired back, prompting Gomez to allege Bieber had cheated on her multiple times when they were together. "I cheated... oh I forgot about You and Zayn?" Justin allegedly wrote in response, suggesting the Come & Get It romanced former One Direction singer Zayn Malik.

Justin then disappointed millions of his fans by following through on his threat to delete his Instagram account on Monday (15Aug16).

Sofia has yet to comment on the feud, but on Tuesday she posted a video of herself dancing and singing to Justin's song Let Me Love You.

Meanwhile, a representative for the Sorry hitmaker claims Bieber was not behind the comments addressed to Selena. Sources told TMZ fake comments posted by trolls were responsible for the war of words - including Justin's allegation Selena cheated on him with Zayn.

The 24-year-old Kill Em With Kindness singer later posted an apology on Snapchat after the spat on Monday, writing "What I said was selfish and pointless."

Gomez and Bieber dated on and off from 2012 to 2014.