The 29-year-old businessman, who Rebel split with in February, posted fire emojis on the photos, which Rebel was quick to "like" in response.
Retired NRL player Sam Burgess and upcoming SAS Australia star also left a comment on the post, writing "taste good?" to the surprise of Rebel's followers.
Rebel and Jacob dated for less than a year, but were never shy about flaunting their relationship on social media, often sharing snaps from romantic getaways and glamorous events.
When they broke things off, Rebel made her relationship status known on Instagram, writing that she was a "single girl heading to Super-Bowl!"
Sources close to the actress confirmed the break-up to Page Six, saying it had "just run its course".
The Pitch Perfect actress, 41, and the businessman, 29, started casually dating before the coronavirus pandemic swept across the globe.
LA-based Busch is a member of Anheuser-Busch brewing dynasty and is rumoured to be worth more than $140 million.
The couple made their red carpet debut at Prince Albert's Planetary Health Gala in Monaco and posed alongside Kate Beckinsale and Helen Mirren.
Wilson told E! News that she started dating Busch before her weight loss journey began.
"It's not like I suddenly lost weight, and then you're like, oh, you get a hot boyfriend — that's not how it works," Wilson said last November. "This guy liked me at 100 kilos and now 75 kilos, I just want to clear out that."
Rebel's latest yacht getaway — one of many luxurious trips she's taken over the past year — included fellow Aussie star Hugh Sheridan, director Alex Hardcastle and creative director and producer Sam Kennedy.
Sheridan's fiance, Kurt Roberts, to whom he proposed during a performance at the Adelaide Fringe Festival this year, was not pictured in the group photos.
