It's a pretty big week for Lab Rats all around: not only did Lab Rats: Bionic Island just air its final episode before transforming into Lab Rats: Elite Force, but today is also actress Kelli Berglund's 20th birthday!
We can't believe that the star is out of her teen years, especially since it feels like just yesterday that the Disney XD series began. In honor of all these occasions, we're rounding up then-and-now pics of the cast!
Click through the gallery to see how much each star has grown up since the start of the Lab Rats franchise. Then, make sure to wish Kelli a very happy birthday by commenting below.
The cast of Lab Rats, Season One
Disney ABC Television Group