Justin Timberlake pens heartfelt song to Britney Spears

Justin Timberlake has apparently penned a heartfelt song to his ex Britney Spears on his new album.

Justin has already sung about his break-up from Britney in his hit 'Cry Me A River', but in the track 'What Goes Around...', on his new album 'Future Sex/Love Sounds', the singer has seemingly made further reference to his old flame.

Fans have made a link between the lines of the song and Britney's troubled marriage to Kevin Federline.

Justin sings: "It's breaking my heart to watch you run around

"'Cause I know that you're living a lie.

"You spend your nights alone, and he never comes home.

"And every time you call him all you get's a busy tone."

It seems Justin, who is now dating Hollywood actress Cameron Diaz, still has feelings for Britney - and even wishes he had married her himself.

Other lyrics read: "You said that you were moving on now, and maybe I should do the same.

"Funny thing about that is I was ready to give you my name."

In the video for his hit single 'Cry Me a River' - released shortly after he and Britney split - a look-alike of the 'Toxic' singer is seen ignoring Justin as he sings about how she doesn't care him anymore.

In other news, Pop tart, Britney Spears has asked Justin Timberlake, to be a godparent to her soon-to-be daughter, due this month reports Star Magazine. Spears and Timberlake dated for almost three years. A source says that Spears’ choice infuriates hubby Kevin Federline, as he thinks “Britney is just doing it so she has an excuse to see Justin.�