Pat Adams, 87, had her birthday wish come true after Clooney turned up unannounced at her assisted living home in Reading with a card and a bunch of flowers.
Pat said: "He was very nice, very nice. He shook my hand and put his arm round my shoulder and I thought, ooh, call again George.
"It's been a lovely day, and a day I won't forget because he's a bit of all right."
They said they didn't expect him to turn up and Pat is still "beaming from ear to ear".
Staff said Pat was "delighted and surprised" with her gifts from Clooney.
Pat said she would "treasure" the card that came with the flowers.
She said: "I said I hoped everything went well and that the wife would be all right and I would like to see a photograph of the babies when they arrive.
"You never know, he might pop in again. Who knows, I'd like a second look at him again if he comes in, because he's a bit of all right!"
Malcolm Hague, from the home Sunrise of Sonning, said: "We are so delighted that Pat's wish came true.
"She was absolutely thrilled to meet her great icon, and it was such a lovely surprise to see George greet her with flowers and a card.
This was a classy gesture from a wonderful man, and it has brought smiles to everyone at Sunrise of Sonning. Huge thank you to George."
Care home staff said there's no other celebrity that Pat wanted to meet, but next time they might try for Brad Pitt.