Dylan and Carys, is that YOU?!

Michael Douglas and Catherine Zeta-Jones stepped out with their two kids in London on Wednesday, June 15 — and we hardly recognized Dylan, 15, and Carys, 13, now that they're so grown up!

dylan and carys douglas splash

Michael, Dylan, Catherine and Carys on June 15.

This time last year, Catherine, 46, took to her Instagram account to share a rare family photo of herself posing with husband Michael, 71, and their two children. We've hardly seen Dylan and Carys since then, which is why their mature appearance in these newest photos is so surprising.

RELATED: Catherine Zeta-Jones Reveals How She Saved Her 15-Year Marriage to Michael Douglas — Get the Details!

Michael and Catherine — who married in 2000 — welcomed Dylan in August 2000 and Carys in April 2003. The actor is additionally a dad to a 37-year-old son, Cameron Douglas, from his first marriage to Diandra Luker.

Click through the gallery below to see more celebrity kids then and now!