The stars have also been liking each other’s social media posts with the singer posting an 'x' in comments underneath a social media posting by Brandon last month in which he voiced support for the LGBTQ community.
Sam was most recently linked to model Jay Camilleri in 2016 after a brief relationship with model Jonathan Zeizel in 2014.
Now just 30 years old, she has reportedly had eight procedures, including an eyebrow lift, a chin reduction and a boob job.
Montag says she had the cosmetic work done after a doctor pointed out everything that was wrong with her—but didn't warn her of all the pain and recovery that would go along with it.
On Monday night, Sam and Brandon were seen grabbing dinner together at Catch NYC with a few friends, according to People.