1. Chris Hemsworth Jason Merritt / Getty Images Hemsworth and his wife Elsa Pataky welcomed their daughter India Rose this year. 2. Curtis Stone Frazer Harrison / Getty Images Stone's son Hudson was born last November, so 2012 is when he celebrated his first Father's Day. 3. Jay-Z Allison Joyce / Getty Images Jay-Z and Beyoncé introduced the world to Blue Ivy in January. 4. A.J. McLean Alberto E. Rodriguez / Getty Images The Backstreet Boy's first daughter, Ava Jaymes, was born to wife Rochelle DeAnna Karidis in November. 5. Nick Lachey Alberto E. Rodriguez / Getty Images Lachey and wife Vanessa Minnillo had son Camden John in September. 6. Jackson Rathbone Michael Buckner / Getty Images Rathbone became a father to Monroe Jackson in July. 7. Benicio Del Toro Scott Barbour / Getty Images He celebrated his first Father's Day this year: Del Toro's daughter Delilah was born in August of 2011. 8. Robbie Williams Ian Gavan / Getty Images The British pop star became dad to Theodora Rose in September. 9. Hugh Grant Jason Merritt / Getty Images Grant's daughter Tabitha was a happy surprise when she was born last November. This year, he celebrated Father's Day for the first time. 10. Eric Johnson Jamie McCarthy / Getty Images Mr. Jessica Simpson's daughter Maxwell Drew was born in May, and Jessica's pregnant with another baby, due next year. 11. Caleb Followill Andy Kropa / Getty Images One of several Kings of Leon, Followill had a daughter, Dixie Pearl, born in June. 12. Hugh Dancy Craig Barritt / Getty Images Just under the wire! Dancy and Homeland's Claire Danes welcomed son Cyrus Michael Christopher on Dec. 17.