Jenna Dewan says watching Steve Kazee embrace fatherhood is 'one of the greatest things' she has ever seen.The Flirty Dancing host and her fiancé became parents to their son Callum in March and this Thursday Jenna posted an Instagram snap of Steve snuggling the baby.Jenna - who also has six-year-old daughter Everly with her ex-husband Channing Tatum - wrote she feels 'so lucky' to have Steve as part of her family. 'The depth of emotion you feel': Jenna Dewan says watching Steve Kazee embrace fatherhood is 'one of the greatest things' she has ever seenAlongside the picture of the 44-year-old actor and their son, Jenna wrote: 'Seeing you become a father is one of the greatest things I’ve ever witnessed.