Slide Into Robert Irwin's Sexy Social Shots to Celebrate His 22nd Bday!

Robert Irwin's got the world at his feet, right now ... and it only took him 22 trips around the sun to blossom into a big star.

Steve Irwin's son just won "Dancing with the Stars" Season 34, and he's got a smoking hot rumored girlfriend in actress Xochitl Gomez ... but forget all that, right now we're focusing on his hottest photos over the years as we celebrate his birthday.

Robert's really taken after his late father by getting in touch with nature ... literally.

The dude's been around some of the most exotic animals on the planet, and one thing is starting to stand out ... Robert's an alpha!!!

Robert got into tip-top shape to dominate the field on 'DWTS' and his gym gains are our gains too ... just take a gander at his workout photos. Crikey!!! Birthday suit on your next birthday?!? 😆