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Just watch.

A photo posted by Jansen Panettiere (@jansenbaker) on

If you even needed reminding,Hayden Panettiere is the proud big sister of this Hollywood hunk. 

Jansen Panettiere is a 22-year-old who followed in his famous sibling's footsteps by becoming an actor, first appearing in made-for-TV movies for Disney and Nickelodeon as a kid in the early 2000s. 

Today, he's busy taking on more adult roles and catching up with Hayden in his free time. "Baby brother time!" the Nashville star tweeted along with a selfie of the brother and sister bundled up in life jackets in a boat. 

However, it was Jansen's movie star looks that fans couldn't help but comment on. "Cute baby brother," one fan quipped. "Omg good looks run in the family," another echoed. 

It's clear the two are close. For Hayden, who helped Jansen navigate through the initial stages of his career, she still thinks there are some things he can teach her. 

"He is a very balanced child," she told TV Guide in 2007. "He has a heart of gold and would never wish bad on anyone. Sometimes I need to take a lesson from him. He keeps his cool really well.

Well, Jansen is no longer a kid, but a full-grown man. That fan was right—good looks really do run in the family.