January 12
- Actress Kirstie Alley will be 67
- Basketball player Dominique Wilkins is 58
- Glee star Naya Rivera turns 31
- Singer Do Kyungsoo is 25
- Lucifer star Rachael Harris celebrates 50
- Baseball player Bobby Crosby will be 38
- Supergirl stuntwoman Jessie Graff is 34
- Hockey player Claude Giroux celebrates 30
- Spice Girls singer Melanie Chisholm turns 44
- On the Job star Piolo Pascual is turning 41
- Singer Amerie will be 38
- Singer Jeremy Camp celebrates 40
- Rapper Raekwon is 48
- Animator John Lasseter is turning 61
- Insecure actress-producer Issa Rae will be 33
January 13
- Stranger Things star Natalia Dyer celebrates 21
- Writer-producer Shonda Rhimes will be 48
- Lord of the Rings star Orlando Bloom is turning 41
- American Crimes star Penelope Ann Miller turns 54
- Bullet for My Valentine bassist Jason James is 37
- Actress Julia Louis-Dreyfus will be 57
- Football player Doug Martin is turning 29
- Ant-Man actor Michael Peña turns 42
- Singer Lee Seung-gi is 31
- Blade: The Series star Jill Wagner is turning 39
- Singer Trace Adkins turns 56
- Hockey player Connor McDavid celebrates 21
- Pretty Little Liars actor Julian Morris is 35
- TV show host Ginger Zee turns 37
- Singer Lee Seung-gi will be 31
January 14
- The Flash star Grant Gustin turns 28
- Gymnast Kacy Catanzaro will be 28
- Rapper-actor-TV show host LL Cool J celebrates 50
- Foo Fighters singer Dave Grohl is turning 49
- Corpse Bride voice actress Emily Watson is 51
- Rocky star Carl Weathers celebrates 70
- Two and a Half Men star Holland Taylor is turning 75
- Wrestler Hacksaw Jim Duggan is 64
- Still Standing star Mark Addy will be 54
- Basketball player Aaron Brooks turns 33
- Rapper Slick Rick is 53
- Actress Faye Dunaway will be 77
- Football player Hakeem Nicks celebrates 30
- Shameless star Emma Greenwell turns 29
- Black Label Society singer Zakk Wylde is 51
January 15
- DJ Skrillex celebrates 30
- Fashion designer Rachel Roy is 44
- Liv and Maddie star Dove Cameron turns 22
- Rapper Pitbull will be 37
- Singer Grace VanderWaal is turning 14
- Baseball player Jose Iglesias is 28
- Wrestler Kelly Kelly turns 31
- Football player Drew Brees will be 39
- American Crime star Regina King is turning 47
- Rapper Young Dro is 38
- Baseball player Matt Holliday turns 38
- Tool guitarist Adam Jones will be 53
- TV show host Claudia Winkleman is turning 38
January 16
- Hamilton actor Lin-Manuel Miranda is turning 38
- TV show host James May will be 55
- Baseball player Albert Pujols is 38
- A Different World star Debbie Allen will be 68
- Singer Sade turns 59
- Boxer Roy Jones Jr. is turning 49
- Charles in Charge star Josie Davis will be 45
- Singer Greg Page is 46
- Director John Carpenter celebrates 70
- Hockey player Matt Duchene turns 27
- Santa Clarita Diet actor Richard T. Jones is 46
- Gymnast Anastasia Grishina is turning 22
- NCIS: Los Angeles star Renée Felice Smith will be 33
- Model Kate Moss turns 44
January 17
- Actor James Earl Jones turns 87
- First Lady Michelle Obama is turning 54
- Actress Betty White celebrates 96
- Actress-singer Zooey Deschanel will be 38
- Basketball player Dwyane Wade is 36
- Rapper-actor Ray J turns 37
- Kaiser Chiefs singer Ricky Wilson celebrates 40
- Sand Angels star Cassie Brennan will be 17
- Rapper Lil Jon turns 47
- Actor-comedian Jim Carrey is 56
- Comedian-TV show host Steve Harvey is turning 61
- Scream: The TV Series star Willa Fitzgerald turns 27
- Dora the Explorer voice actor Caitlin Sanchez will be 22
- TV show host Maury Povich is 79
- Lost star Naveen Andrews turns 49
January 18
- Rapper Estelle is turning 38
- Actor Kevin Costner turns 63
- The Flash star Jesse L. Martin will be 49
- Football player Julius Peppers is 38
- Hannah Montana star Morgan York turns 25
- Singer Jason Gray is turning 46
- Backstage star Romy Weltman celebrates 18
- Singer Betsy-Blue English will be 22
- Korn singer Jonathan Davis is turning 47
- Last Man Standing star Sarah Gilman turns 22
- Guardians of the Galaxy star Dave Bautista will be 49
- Actor-writer Jason Segel is 38
- Wrestler Ted DiBiase turns 64
- The Ting Tings singer Katie White will be 35
- Glee star Becca Tobin is turning 32