It's National Sibling Day! These celebs get to celebrate with someone equally famous every year.
Maggie and Jake Gyllenhaal Then:
Source: Vince Bucci / Getty Images
Maggie and Jake Gyllenhaal Now:
Source: Frazer Harrison / Getty Images
Liam and Chris (and Luke) Hemsworth Then:
Source: gocitygirl.com
Liam and Chris Hemsworth Now:
Source: Michael Loccisano / Getty Images