Connor Cruise, Isabella Cruise Look All Grown Up In New Instagram Pic

07/25/2013 01:47 pm ET | Updated Jul 26, 2013

It's hard to believe that Tom Cruise and Nicole Kidman's kids are adults.

Connor Cruise, 18, shared a photo of him and his sister Isabella Cruise, 20, on July 23, writing, "Hangin with Bellz in London."

The siblings took in the sights of Hyde Park on Barclays Bikes (which are just like NYC's Citi Bikes) and even posted pictures and a video from their little excursion.

Connor and Isabella, who have three half-sisters -- dad Tom Cruise's daughter Suri with ex Katie Holmes and mom Nicole Kidman's girls Sunday and Faith with husband Keith Urban -- look all grown up. Remember when they were just toddlers?

Where does the time go!

Also on HuffPost:

Celebrity News & Photos
Suggest a correction