The 30 Rock star's sibling said that he had a great day at the nuptials in New York last month, and claimed that he could not be happier for his sibling.
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He told Access Hollywood: "The wedding was fantastic. It was incredible, beautiful, went off without a hitch.
"Hilaria was gorgeous, Alec was over the moon. I can't be more happy for him, he looks great and he's in love and I wish him all the best."
Stephen also suggested that his brother's new slim frame may be because his new wife is a yoga teacher.
He joked: "His new wife is a yoga instructor, so obviously you're seeing Alec look so well as a result of the downward dog, so to speak."
