For months, Heidi Klum's 1-year-old daughter Leni has been preparing for her sibling's arrival. "She pointed to Heidi's stomach every morning," reports Klum's husband, British pop singer Seal, "saying the words 'baby, baby.' " And on Sept. 12 Leni greeted Henry Giinther Ademola Dashtu Samuel with kisses. "They're so happy Leni has a baby brother," says a source close to the Project Runway host, 32. The couple plan to bring the baby—-who carries the last name of his dad, born Sealhenry Samuel, and got the name Günther from Heidi's father—home to their Bel Air estate, which has plenty of room for a big brood. "The arrival of any child brings you a lot of happiness," Seal, 42, told PEOPLE in April. "If we're lucky enough, we'll have more."

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IT'S A BOY! Henry Günter Ademola Dashtu Born Sept. 12 8.9 lbs., 21 in.