The 'Hills' alum recently went her separate ways from the singer - whom she also dated for six months back in 2010 - after five months of dating, and it has now been revealed that whilst the pair decided to call time on their romance, they're still close and have ''hung out'' since ending their relationship.
A source said: ''They are really good friends first and foremost. Even though they're not together romantically anymore, they have hung out and spent time with each other.''
The split reportedly came as the pair - who rekindled their romance in the wake of the 33-year-old reality star's tumultuous divorce from Corey Bohan - wanted to live ''two different lives'', with Ryan, 36, much more focused on living a ''bachelor style life''.
The insider added to Us Weekly magazine: ''Ryan considers her a friend first and foremost. They were just having fun together. Ryan enjoys his bachelor style life. They just live two different lives. Both busy and not in a place to be focusing on their relationship.''
Previously, the brunette beauty had admitted she was ''the happiest she's ever been right now'' after getting back with Ryan.
She added: ''We're just having fun. Nothing is forced. You know, great things happen when it's not forced, and things are naturally just happening. And that's what it is. We just have the best time together.''
The 'Dancing with the Stars' alum is also currently battling for sole custody of her two-year-old daughter Kirra, whom she has with estranged husband Corey, after she filed court documents seeking a restraining order against her former beau, and asked that his visitation rights to their daughter be stopped.
According to court documents, Audrina accused Corey of ''stalking'' her on social media and being ''angry, rude and emotionally abusive'' to Kirra.
The swimwear designer specifically discussed an alleged incident in which she claimed she was threatened by her estranged husband.
She stated in the documents: ''I am more afraid of him now than ever, and fear for the safety of our daughter Kirra when she is in his care.''
His new album Underneath It All is out now.