They met last June in Kobe at the Tohoku Earthquake Charity Live, where both SPEED and ET-KING performed together.
Uehara will be the second member of SPEED to get married. The first was Eriko Imai (28), who married 175R vocalist SHOGO in 2004, but they divorced in 2007.
She is also known to have dated Jin Akanishi and DA PiMP's Issa Hentona in the past.
Sources: 1, 2, 3