Khloe Kardashian, Britney Spears, Brad Pitt Fall From Forbes Celebrity 100

Britney Spears, Brad Pitt and Khloe Kardashian fell off the Forbes Celebrity 100 list for not reaching top earnings while Khloe's sister, Kim, was the only reality star to rank on the list, Forbes published Wednesday.

Pop star Spears ranked sixth on the list in 2012 with $58 million in earnings. She hosted The X-Factor this past season, but her earnings were not enough to land her a spot in the top 100. The singer did not go on tour this past year, which is a main means for singers to make top earnings. She earned an estimated $24 million over the past 12 months, a drastic drop from the previous year.

Khloe Kardashian, who came in at no. 73 last year with $11 million in earnings did not make the list this year. The only reality TV star to make the 2013 list was her sister, Kim, who earned $10 million this past year, landing her at 66th on the list.

Pitt was in production for the film World War Z during the past year, which left him working on little else and brought his earnings for the past 12 months down. Before 2013, the actor was on the Celebrity 100 list for nine consecutive years.

Bethenny Frankel is another reality star who failed to rank on the list this year.

She held a place at no. 97 last year with $12 million in earnings, but she did not earn enough or have significant time in the spotlight this past year to rank on the current list.

The singer Adele is another performer who also did not tour this past year and earned approxiamately $20 million and not enough for her to rank on the list. She debuted at 24th place with $35 million in 2012 on the Forbes Celebrity 100.

Take a look at the list of 2013's Forbes Celebrity 100 here.