"......well dizzzzam @Usher . Yep!!! That's it ;-)," Foster wrote alongside the pic.
The tweet obviously comes as a bit of a surprise seeing how the two divorced in 2009 and have been battling it out ever since Usher received primary custody of their two sons in 2012.
Their most recent court confrontation took place in August when an Atlanta judge dismissed Foster's request for temporary custody of their kids following the near drowning of their 5-year-old Usher Raymond V.
As for Usher's impressive body in Men's Health, it stems from all the rigorous training he's been doing to portray boxer Sugar Ray Leonard in the upcoming film Hands of Stone.
"My commitment to this character demands that I not only physically get ready, but also become him," he tells the magazine. "The hair, the personality, the manner he conducts himself in—all that. He's an incredible man."