Olivia Culpo proved she’s boyfriend Christian McCaffrey‘s biggest cheerleader with her latest loved-up Instagram post.“ITS GAME DAY ‼️‼️ lets goooo @christianmccaffrey,” the model, 28, captioned a series of steamy vacation photos on Sunday, September 13, as the Carolina Panthers player, 24, geared up to kick off the NFL season against the Las Vegas Raiders.In the two pictures, Culpo packed on the PDA with the athlete as they goofed off on a tropical getaway.