Sir Elton John and David Furnish with ZacharyOh, baby! Sir Elton John and partner David Furnish are on the cover of OK! Magazine UK with the latest addition to their family: baby Zachary.

Their bundle of joy, born on Christmas Day, has changed their lives in ways they couldn't imagine, they tell the magazine.

"I've never felt anything like it in my life," John said about holding his son for the first time. "You're so awestruck, I will never forget that feeling ever."

John and Furnish already have a parenting plan in place for Zachary.

"I'm ready to have a child and lavish my love on our son and not spoil him materially," John said.

The road to parenthood hasn't been an easy one for the couple, who tried to adopt two orphaned Ukrainian brothers -- one of whom is HIV positive -- in 2009, but were denied. The boys are reportedly in the orphanage looking for a home.