Watch: McGregor morphs from start of career to now

Conor McGregor's beard and tattoos are now part of his trademark look, but when the UFC lightweight champion made his professional debut in 2008, he was fresh-faced and ink-free.

See how McGregor and other UFC stars have changed over the course of their careers in these GIFs from Betonline.ag.

Conor McGregor

Jon Jones

Demetrious Johnson

Nate Diaz

Jose Aldo