Roberts, 21, and Overstreet, 23, split up after nine months of dating. They reportedly reunited two weeks ago and have been inseparable ever since.
"They are back together," a friend of the couple told E! News. "Ultimately, they enjoy spending time together and they wanted to give it another shot. They make each other laugh and they are both very supportive of one another's successes. ... They are now taking things day by day and having fun. Whether it lasts, we'll have to wait and see. They are not putting pressure on themselves to make it work."
Overstreet is a cast member of TV's "Glee."
Roberts' film credits include "Ice Princess," "Aquamarine," "Nancy Drew," "Hotel for Dogs," "The Winning Season," "Valentine's Day" and "Scream 4."