By Raquel Hecker

July 31, 2005 | 8:00 p.m

John Michael Rollins June 27, 2005 5:18 a.m. 8 pounds Saint Barnabas Medical Center, Livingston, N.J.

A mini–media mogul in the making? John Rollins, 41, the publisher of Elle, has sired a son with Dana Sacher Rollins, 37, the chief operating officer of Tracks magazine, the Rolling Stone alternative that the couple, married for two years, started together in 2002. Born via caesarean, the junior John, who has already been nicknamed “Jack,” has brown hair, full lips, bird legs and his mother’s striking hazel eyes. “He’s a very happy baby,” said Mom. “Stays awake all day and sleeps all night.” Jack joins Samantha, 10, Mr. Rollins’ daughter from a previous marriage, who “loves staring at him,” according to the new Mrs. Rollins.