Justin Timberlake's anniversary gift to Jessica Biel was a soulful rendition of the song they danced to at their wedding — and it was the sweetest

• Singer Justin Timberlake and actress Jessica Biel have been married for five years.
• To celebrate their anniversary on Thursday, Timberlake sang their wedding song — "A Song for You" by Donny Hathaway.
• Timberlake shared the video on Facebook and wrote that Biel is his "best friend." 
• "Yes, I've been back in the studio cooking! But, today is even more special for me because five years ago, on this day, I became the luckiest man in the world when I exchanged vows with my best friend," he wrote in the post. 
• Watch the full video below. 

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