Gisele Bündchen is channeling her inner Frankie Valli for Tom Brady's 44th birthday ... penning a mushy love letter to her man -- saying, "You’re just too good to be true."
The international supermodel took to her Instagram on Tuesday to deliver the G.O.A.T. his special birthday greeting ... posting a cute pic of the couple and quoting a Frankie Valli & The Four Seasons classic hit.
"You’re just too good to be true," Gisele wrote. “Can’t take my eyes off of you. You’d be like heaven to touch.