While we can’t confirm for definite that the man was Rob, in another video from the birthday celebration posted to Khloé Kardashian’s Instagram story, a female voice can be heard shouting, “Robert! Robert!”
Back in June, Robert – who shares two-year-old daughter, Dream with ex Blac Chyna – appeared to indicate he was on a health kick.
The reality-TV star took to Twitter to post a photo from inside a gym with the caption: “Day 1 all good”.
Fans were quick to praise the former star of Keeping Up With The Kardashians.
One fan wrote: “Yessss go rob go!!!” and another said, “Hope to see updated pictures of ur weightloss journey.”