Riley Gaines Announces She's Pregnant, Takes Jab at Simone Biles

Riley Gaines is going to be a mom ... announcing she's pregnant with her first child -- and taking a dig at Simone Biles in the process.

The former collegiate swimmer turned Outkick host revealed her big news at a Turning Point USA event on Saturday ... bringing up Biles' recent comment comparing her height to a man's in order to do it.

Riley says she thought it was totally ironic when Biles said, "bully someone your own size, which would ironically be a male" ... asking the crowd how many men they know who have "this."

By "this" she's referring to her growing stomach -- pulling her dress flesh against her stomach and revealing a sizable baby bump.

The crowd screams and cheers at RG's good news ... and, later on in the event, she referred to her unborn child as a "young girl" -- so, it seems there's no need for a gender-reveal party, 'cause she already knows the sex.

Simone hasn't responded to the mention in Riley's pregnancy announcement -- she's actually been off X since she apologized publicly for her back-and-forth with Gaines -- but, it seems Riley's still not over their tiff.