1. Hopefully, he won't sing his awful rendition of "She Bangs" when he turns 30 on January 13.: William Hung
2. Gotta Tell You that this Irish singer of Zambian descent celebrates her 30th birthday on January 18.: Samantha Mumba
3. One of the first out gay performers on American Idol will be 30 on February 8 - who is he?: Jim Verraros
4. This country superstar will probably be a "Good Girl" at her 30th birthday celebration on March 10 - unless a "Cowboy Casanova" is one of the guests.: Carrie Underwood
5. Hard to believe that the lead singer of "MMMBop" will be 30 on March 14 - which Hanson brother is he?: Taylor Hanson
6. "It's Goin' Down" that this rapper's turning 30 on April 2 - will he have to change his name?: Yung Joc
7. This British artist should have a "Dynamite" time when he turns 30 on April 23.: Taio Cruz
8. Sadly, this singer who should have gone to "Rehab" didn't live long enough to turn 30 - she would have on September 14.: Amy Winehouse
9. Four the Record, this country singer will celebrate her 30th birthday on November 10 with her husband, Blake Shelton.: Miranda Lambert
10. Three members of One Direction turn 20 this year. The first, who is part Pakistani, celebrates his birthday on January 12 - who is he?: Zayn Malik
11. This aspiring singer will turn 20 on March 4 with her dad Bobby Brown, but without her famous mother who died last year.: Bobbi Kristina Houston Brown
12. Will Mick be a guest at this "Swagger Jagger" singer-rapper's 20th birthday party on July 28?: Cher Lloyd
13. It would be So Uncool if we forgot this singer and actress' 20th birthday on August 26.: Keke Palmer
14. Another One Direction singer - the one from Wolverhampton - will be 20 on August 29. Who is he?: Liam Payne
15. He's the Irishman in One Direction, and his 20th birthday is September 13.: Niall Horan
16. We first heard his bass voice singing country songs on American Idol, and he'll be 20 on October 9.: Scotty McCreary
17. This Hawaiian singer, who co-starred in Justin Bieber's "Baby" video, won't be a baby anymore on December 7 when she turns 20.: Jasmine Villegas
Bonus: Guests at her 10th birthday party on October 28 should include half-sisters Heather, Mary, and Stella, half-brother James, and step-mom Nancy.: Beatrice McCartney