Justin Timberlake serenaded Jessica Biel at her birthday dinner on Monday (03.03.14).

The couple were joined at The Forge in Miami by the singer-and-actor's parents and the 'Social Network' star sang 'Happy Birthday' to his 32-year-old wife.

A source told the New York Post newspaper: ''He sang a few lines of 'Happy Birthday'. But nothing over-the-top. They looked extremely happy and comfortable.''

Jessica attended the Oscars alone on Sunday (02.03.14) because her husband was busy with his tour commitments, so Justin's grandma, Sadie Bomar, will be pleased he was able to celebrate his wife's birthday as she recently voiced her concerns that the couple - who married in 2012 - spend too much time apart.

She said: ''They are married but they are so busy, both of them, it's hard going.

''I'm sure when it's right to have children they will, but not now.

''They do love each other dearly but they are apart so much it's going to be hard going for them.

''I think Jessica finds that really tough. She's on her own a good deal.

''If he's not coming back at night that puts a strain on things, of course it does.

''It's hard to keep it all going but you have to have faith to keep it all going.

''I have faith in them and I believe they love each other dearly but I know they need time together.''