The reality show star also shared a snap of his pregnant girlfriend Blac Chyna looking trim alongside a motivational message which saw him pledge to get in shape once the couple's daughter is born next month.
The snaps show the pair looking in great shape, with Chyna flaunting her toned and tattooed curves in a skimpy bikini while he poses in a white vest.
'Oh yeah we snapping back lol,,, baby will be here in 4 weeks and I'm done with carrying this pregnancy weight,' Rob wrote alongside the snaps.
'Me and my baby gonna be righttttttt, MOTIVATION TIME‼️ we almost there Chy FAAAAACK.'The dad-to-be finished his motivational message by declaring: 'Chy looks so bomb here aghhhh'.