Olivia Culpo's younger sib, Sophia, confirmed her relationship with NFL player Braxton Berrios went kaput ... with the model/influencer firing off a number of TikToks with her sister about living the single life.

Rumors surrounding the end of the couple were circulating for weeks ... after fans noticed the once-inseparable duo suddenly stopped appearing on each other's social media platforms.

In fact, Braxton -- who signed with the Miami Dolphins earlier this month -- elected to take his mother on a Hawaiian vacation last week ... which, no disrespect to moms across the globe, seemed like what someone would do if they didn't wanna waste a getaway trip that was already booked prior to a breakup.