George Clooney is engaged! Which celebrities are excited for George Clooney and his girlfriend Amal Alamuddin's wedding this September?

Julia Roberts said George Clooney and girlfriend Amal Alamuddin getting engaged was "sublime," while appearing on "The Ellen DeGeneres Show" Wednesday, E! News reports.

Julia Roberts, who is good friends with the engaged George Clooney, said that while she has yet to meet Clooney's girlfriend Amal Alamuddin, Roberts thinks "She is beautiful and smart, and he is happy and that's what matters to me."

Which other celebrity gave his blessing to George Clooney and his girlfriend?

Matt Damon!

"I'm just thrilled that he met Amal and that they're as happy as they are," Matt Damon gushed about his "Monuments Men" co-star to Closer Weekly, The Huffington Post reports. "He deserves it."

Meanwhile, RadarOnline.com has found out when the king of bachelors will make Amal his wife!

"The wedding is to take place in September," an insider revealed to Radar.

"They've told family and friends they will only disclose the location at the last minute, and it will be very private. Neither George nor Amal want the wedding to be a public affair - and her family really doesn't either."

Clooney, 53, even surprised the future Mrs. Clooney's family when he proposed!

"George didn't get a formal permission from her dad, but it was an indirect hint," the source reveals. "He definitely tossed the subject of marriage around with them so that he knew they would approve, but he really wanted the proposal to be a total surprise, and didn't want to give away any hints about when it was going to take place."