updated 06/06/2011 AT 9:30 AM ET
•originally published 06/05/2011 AT 11:30 PM ET
After meeting in March, Nikki Reed and Paul McDonald embarked upon a whirlwind romance – and now they’ve taken the next step.
The Breaking Dawn star, 23, and her American Idol alum beau, 26, are engaged, a source confirms to PEOPLE.
Posing together at Sunday’s MTV Movie Awards, the couple showed off a sparkler on Reed’s left ring finger as she told E!, “He’s the one.”