When Elton John‘s baby son calls for “mommy and daddy,” at least four people could answer. Sir Elton and his longtime partner David Furnish used fertility clinic The Center for Surrogate Parenting in California’s San Fernando Valley and two different women — an egg donor and surrogate — to bring them their “Blessed” arrival, sources said. “I can confirm that Elton John and David Furnish worked with the center . . . and it was a lovely, beautiful surrogacy journey for all parties involved,” said clinic rep Joanne Bubrick, who declined to reveal any details about baby Zachary Jackson Levon Furnish-John‘s two mothers, or the identity of the biological father. The 7-pound, 15-ounce bundle of joy was born on Christmas Day, and John and Furnish have told of their joy at becoming parents following a long battle to adopt.