De Santis invited Timberlake to a Marine Corps ball in Virginia via an online video in 2011, an invitation which he accepted.
E! Online reports that Timberlake invited De Santis to be his date at the Guys Choice Awards ceremony in Los Angeles this Saturday (June 2), where he received awards for 'Troops' Choice' and 'Entertainer of the Year'.
On stage to accept his awards, the singer and actor said: "It's amazing actually to be standing on stage with these American heroes.
"As some of you know I'm usually a wiseass, but in all seriousness, I can tell you receiving this award from our troops is seriously one of the greatest honors that I or any American could receive."
Timberlake recently celebrated his engagement to Jessica Biel at a private cocktail party in LA.
The Guys Choice Awards will air next Saturday (June 9) on Spike TV.