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14 November 2011, 16:05 | Updated: 14 November 2011, 16:07
The 'Sexy Back' star joined 23-year-old at the event in Virginia after receiving invite.
Justin Timberlake attended the Marine Corps Birthday Ball in Virginia as the date of Corporal Kelsey de Stantis over the weekend.
The former N*Sync singer was invited to attend the event by De Santis in July after his Friends With Benefits co-star Mila Kunis received a similar invitation.
In a blog on his official website, Justin said he was "truly moved" by the Ball, which took place at the Greater Richmond Convention Center.
He wrote: "I felt so proud to be there. I felt like I was getting a chance to be among my heroes. It's funny too, because a lot of them are SO much younger than me."
Speaking about his date for the night, Justin added: "She seemed to me to be so humble and honest ... very cool.
"She simultaneously seemed like she was nervous about the whole evening and if I was going to enjoy myself. 'Are you ok?' she asked 2 or 3 times. 'I hope you are having fun. I know you will once my crew of friends get here to the table.'
"I have to tell you, it's not every day that I meet a 23-year-old girl and she's more worried about if I'm having fun or if I'm comfortable."
Meanwhile, Mila will join her marine date Scott Moore, at a similar ball in Greenville, North Carolina-area ball later this month.