"The twins are wonderful," Harris told Us Weekly at the Beastly premiere in L.A. last month. "They're just about to start sucking their thumbs, so I can get rid of mine!"
The proud father, who plays Barney Stinson on CBS' How I Met Your Mother, couldn't help but share an adorable photo of his three favorite people on Twitter.
"Relaxing on a Sunday afternoon," Harris wrote on April 17. "My heart is full of love."