Motley Crue’s Nikki Sixx Surprises Girlfriend Courtney Bingham On Her Birthday (EXCLUSIVE PHOTOS)

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He may be one of the bad boys of rock, but he’s one of the good guys of love.

Motley Crue bassist Nikki Sixx, 53, surprised his girlfriend, Courtney Bingham, 27, on her birthday by filling his tour bus with tons of silver and white balloons and a cake that read “Happy Birthday Baby,” as Celebuzz’s exclusive photos reveal.

Who knew Sixx has such a soft side?

Sixx, who’s been linked to fellow-tattooed celeb Kat Von D in the past, seems to have taken quite a liking to his girlfriend. Despite the almost 30-year age difference, the two have been romantically linked for almost two years and aren’t showing any signs of cooling off.

The key to their relationship success? Possibly the fact that Bingham has been joining Motley Crue on the road during its cross-country tour.

A source tells Celebuzz that Sixx’s “kids love her to death” and that “they are extremely in love.”

What’s the best surprise you’ve ever received for your birthday? Tell us in the comments section below.