He revealed that his relationship with the groom stemmed back years when he attended brand's Little Black Jacket Exibit, celebrating his new book, on Wednesday.
He told Us Weekly: "His father [Arie Kopelman] was the President of Chanel America," Lagerfeld explained to Us. "Will is divine and sweet. They're a good match!"
The 78-year-old style guru said that the white, pleated muslin and organza custom creation worn by the 37-year-old 'Big Miracle' star, worked out well considering she is pregnant.
"She knew what she wanted . . . and she got it. [There was] only so much we could do. [But] for someone who is pregnant she looked perfect."
Drew and art consultant Will, 34, said "I do" on her Montecito, California estate on Saturday (02.06.12), in front of 170 guests - including her godfather Steven Spielberg, Scarlett Johansson, Reese Witherspoon and Jim Toth, Busy Philipps, and Jimmy Fallon.
A guest said: "When they looked at each other, it was so real. I've never seen two people more in love."