"He'd marry her today if he could," the insider tells Us, "but he wants to give her a dream wedding."
Adds the source, "It is her first, and he wants it to be his last!" Clooney, 53, was previously married to actress Talia Balsam back in 1989, but the couple divorced in 1993. In the interim years between their marriage and his engagement to Alamuddin, Clooney was dubbed the "eternal bachelor."
Clooney, though, isn't the only one anxious to speed up the nuptials. The Lebanon-born beauty's parents "are old-fashioned when it comes to these things," another insider tells Us. "They expect a short engagement."
As for the actual location of the ceremony, the London-based attorney and L.A. resident are considering his beloved Lake Como, Italy, or Cabo San Lucas, Mexico. (Clooney owns properties in both spots.)
Previewing their fall wedding festivities, the couple celebrated with close pals last weekend in Malibu. An eyewitness at the Cafe Habana told Us Clooney's close pals Cindy Crawford, her husband Rande Gerber, and U2 rocker Bono joined the party. The observer added, "Bono sang, 'Wonderwall!'"
For more -- including Prince Harry's rebound hookup and Eric Johnson and Jessica Simpson's wedding plans -- watch this week's Hot Stuff video featuring Us Weekly Entertainment Director Ian Drew and special guest, One Tree Hill alum and star of Fox's Gang Related Shantel VanSanten!