"Happy (first) Father's Day to Tildy's favourite person!" Kaley Cuoco wrote in honour of her partner's first Father's Day as a dad. "@tommypelphrey watching you become a dad has been the joy of my life! No one loves you more than that little lady (besides me) we 💙you forever and appreciate all you do for our family! And to my dad ! The greatest pops and gramps on earth! Matilda is one lucky widdle chunk!"