The star covers the latest issue of 'Men's Fitness.'
The singer shared the story on 'The Ellen DeGeneres Show.'
'The Big Bang Theory' star called his boyfriend "the best thing that ever happened to me" in the caption.
Both actors were on a flight back to the USA from Berlin.
Lindsay Lohan also debuted darker locks.
The singer visited the 'Ellen DeGeneres Show' where he opened up about the special moment.
The actress got candid with ET on Wednesday, revealing details from her romantic wedding and why she opened herself up to fall in love again.
The 'Lowriders' star spoke with ET about her famous guests, her dress, her ring and her philosophy on relationships.
A slew of A-listers flew to Mexico to attend the 'Desperate Housewives' actress' beautiful ceremony.
The 44-year-old stepped out at the amFAR Inspiration Gala in Brazil over the weekend.
The 43-year-old is up for three awards at this year's ceremony, airing Nov. 19 on Univision.
ET caught up with him on the set of 'La Banda' in Miami.
The 25-year-old brought out some major star power for the Miami stop of her '1989' world tour!
The '1989' singer also got her very own Miami Heat jersey from NBA star Dwyane Wade.
