The 8 Biggest Scandals of 2015: Bill Cosby, Josh Duggar, Charlie Sheen & More

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1. Josh Duggar: After admitting to molesting five young girls when he was a teenager (four of whom were his younger sisters), the 19 Kids and Counting star confessed to cheating on his wife. He later checked into a treatment center.

2. Bill Cosby: After the initial firestorm began in 2014, the 78-year-old comedian's downfall continued through 2015, as more women came forward with allegations that he sexually assaulted them. Cosby, who has denied all wrongdoing and has never been charged with a crime, recently filed a countersuit against seven of his accusers. He also filed suit against Beverly Johnson for defamation, after the model claimed she "felt drugged" after sipping a cappuccino that Cosby allegedly offered her in the mid-1980s.

3. Justin Bieber Nude Pics: Naked photos of an unsuspecting Bieber were published in October, showing the singer in the buff during a vacation in Bora Bora. Days later, the pop star's dad, Jeremy, tweeted his congratulations. "@justinbieber what do you feed that thing. #prouddaddy," he wrote, also adding a blushing emoji.

4. Nannygates: Ben Affleck and Jennifer Garner announced they were divorcing in June right before rumors cropped up that the split was due to Affleck's alleged infidelity with the couple's nanny, a claim the Gone Girl star has vehemently denied. Despite the divorce announcement, Ben and Jennifer are currently still legally married. Infidelity is also suspected to be the cause of Gwen Stefani's split from Gavin Rossdale. The Bush frontman has denied claims that he was having an affair with their children's nanny.

5. Charlie Sheen Fallout:The former Two and a Half Men star appeared on the Today show on Nov. 17 to confirm his HIV-positive status. Following the announcement, the actor's ex-fiancee, Brett Rossi (real name Scottine Ross), filed a lawsuit against him, claiming that during their relationship, the Golden Globe winner was physically abusive, hid his HIV-positive status and forced her to get an abortion. Sheen's lawyer, Martin D. Singer, denied the claims against his client. "Charlie Sheen intends to vigorously defend the lawsuit filed by Scottine [Brett Rossi] Ross. Numerous witnesses will dispute each and every claim made by Ms. Rossi," Singer said in a statement to ET. "We are confident that Mr. Sheen will prevail in this action and also will recover significant damages against her in connection with a pending arbitration that was commenced months ago."

6. Kim Richards:The Real Housewives of Beverly Hills star admitted to having a substance abuse problem during a heated interview with Dr. Phil before being charged with battery of a police officer and public intoxication. During the rollercoaster exchange, Richards stormed off when she was confronted about her use of drugs and alcohol, but eventually checked into rehab. Richards was later granted a temporary leave from rehab to attend her daughter Brooke's wedding in Mexico over Memorial Day weekend. The reality star spent a night in jail in August after being placed under citizen’s arrest after being suspected of shoplifting.

7. Fashion Police Comments About Zendaya: The E! fashion commentary show was placed on hiatus after co-hosts Kelly Osbourne and Kathy Griffin exited the program. The timing of their departures was of note, as it came after a comment co-host Giuliana Rancic made about Zendaya's dreadlocks at the Oscars. During an episode of Fashion Police, Rancic said the actress-singer's hairdo made her look like she "smelled like patchouli oil or weed."

8. Brian Williams:The trusted news anchor was suspended -- and later permanently removed from the NBC Nightly News anchor chair -- after falsely claiming that he had come under fire while covering the Iraq War in 2003.