Jennifer Hudson and Jessie J Cover 'Titanium' (VIDEO)

HBO's first-ever Concert for Valor, in honor of veterans, was held on Tuesday at the National Mall. The special featured appearances by huge music stars, from Rihanna to Bruce Springsteen. However, it was a duet between two divas that served as the big showstopper.

Jennifer Hudson and Jessie J teamed up to deliver a cover of "Titanium" by David Guetta featuring Sia. The piano arrangement offers the duo the perfect platform to show off their absolutely stunning vocals -- before the tempo kicks up and it gets downright intense. Seriously, this may be an overdone song, but this is a downright terrific cover, imbued with all sorts of emotion and passion, as befitting a concert honoring our fighting men and women of all generations. It's definitely worth checking out, since I can't imagine many other contexts for a duet like this presenting themselves again in the near future (unless they feel like singing Christmas carols together -- and I'd be all for that).

Watch the full performance video below: