Let the wedding planning begin!
Alamuddin's mom arrived at her home shortly after and was carrying a big congratulations balloon as well as some flowers.
And upon arrival at Heathrow Airport, the bride-to-be flashed that massive diamond ring Clooney gave her as she made her way outside.
The sightings come just two days after the couple celebrated their engagement with a star-studded party at Cafe Habana in Malibu, Calif., on Sunday. U2 frontman Bono, the restaurant's owner Rande Gerber and his supermodel wife, Cindy Crawford, were among those in attendance.
According to our source, the bash was well underway by 7 p.m. and the group partied outside in the back of the restaurant under a covered patio, where there was a lot of hugging and kissing as Alamuddin went around showing off her engagement ring from Clooney.
The source said Clooney looked very relaxed and was constantly smiling and laughing, adding that he and Alamuddin definitely appeared happy and in love.
It's been a whirlwind week for the loved-up couple, who recently returned from Cabo San Lucas, where they were photographed together on Wednesday evening.
A source exclusively told E! News the Monuments Men star, who just celebrated his 53rd birthday, and his stunning fiancée, 36, had a romantic dinner followed by an evening of fun with nine friends at downtown hot spot Harbard. The pair were holding hands throughout the night, and as one eyewitness said, "You can tell these two are in love."
Last month, Clooney popped the question to the beautiful human rights lawyer and presented Amal with a stunning seven-carat diamond ring—reportedly over a home-cooked meal—after just seven months of dating.
The couple later celebrated the happy news while dining at Malibu restaurant Nobu with Cindy Crawford and her husband Rande Gerber.
While the couple has yet to open up about their engagement, the brunette beauty has earned the stamp of approval from George's family; his mother and father have both sung Amal's praises.
"We are very pleased," Clooney's father, veteran broadcaster Nick Clooney, told E! News. "We like Amal and we are very excited for our family and thrilled for them."
And it looks like Amal's mother agrees!