| 142561 | December 18 | Birth | 1978 – Katie Holmes, American actress |
| 142562 | December 18 | Birth | 1978 – Naomi Lang, American ice dancer |
| 142563 | December 18 | Birth | 1979 – Eric Pérez, Puerto Rican wrestler |
| 142564 | December 18 | Birth | 1979 – Mamady Sidibé, Malian footballer |
| 142565 | December 18 | Birth | 1980 – Christina Aguilera, American singer-songwriter, producer, and actress |
| 142566 | December 18 | Birth | 1980 – Heinz Inniger, Swiss snowboarder |
| 142567 | December 18 | Birth | 1980 – Benjamin Watson, American football player |
| 142568 | December 18 | Birth | 1983 – Andy Fantuz, Canadian football player |
| 142569 | December 18 | Birth | 1984 – Paul Harrison, English footballer |
| 142570 | December 18 | Birth | 1984 – Derrick Tribbett, American bass player and singer (Twisted Method and Dope) |
| 142571 | December 18 | Birth | 1985 – Tara Conner, American model, Miss USA 2006 |
| 142572 | December 18 | Birth | 1985 – Natalie Gal, Russian-American model and actress |
| 142573 | December 18 | Birth | 1985 – Hana Soukupová, Czech model |
| 142574 | December 18 | Birth | 1986 – François Hamelin, Canadian speed skater |
| 142575 | December 18 | Birth | 1986 – Usman Khawaja, Australian cricketer |
| 142576 | December 18 | Birth | 1986 – Bill Stull, American football player |
| 142577 | December 18 | Birth | 1987 – Miki Ando, Japanese figure skater |
| 142578 | December 18 | Birth | 1987 – Ayaka, Japanese singer-songwriter and producer |
| 142579 | December 18 | Birth | 1987 – Yuki Furukawa, Japanese actor |
| 142580 | December 18 | Birth | 1987 – Fernando Jara, Panamanian jockey |
| 142581 | December 18 | Birth | 1987 – Minami Tsukui, Japanese actress |
| 142582 | December 18 | Birth | 1988 – Lizzie Armitstead, English cyclist |
| 142583 | December 18 | Birth | 1988 – Seth Doege, American football player |
| 142584 | December 18 | Birth | 1988 – Brianne Theisen-Eaton, Canadian heptathlete |
| 142585 | December 18 | Birth | 1989 – Emily Atack, English actress |
| 142586 | December 18 | Birth | 1989 – Ashley Benson, American actress |
| 142587 | December 18 | Birth | 1989 – Ashley Slanina-Davies, English actress |
| 142588 | December 18 | Birth | 1990 – Sierra Kay, American singer-songwriter (Versa) |
| 142589 | December 18 | Birth | 1992 – Bridgit Mendler, American singer-songwriter, producer, and actress |
| 142590 | December 18 | Birth | 1993 – Byron Buxton, American baseball player |