Spears adopted more mature and provocative themes for her next two studio albums, Britney (2001) and In the Zone (2003), and made her feature film debut in a starring role in Crossroads (2002). Following a series of heavily publicized personal struggles and erratic public behavior, Spears's career was interrupted, before the release of her fifth studio album Blackout (2007), which is often critically referred to as her best work. Her erratic behavior and hospitalizations led Spears to be placed on a still ongoing conservatorship. She returned to the top of record charts with her sixth and seventh studio albums, Circus (2008) and Femme Fatale (2011), respectively. In 2012, Forbes reported that Spears was the highest paid female musician of the year, with earnings of $58 million, having last topped the list in 2002. During the promotion of her eighth and ninth studio albums, Britney Jean (2013) and Glory (2016), Spears embarked on a four-year concert residency, Britney: Piece of Me, at Planet Hollywood Resort & Casino in Las Vegas, which became one of the highest-grossing residencies of all-time. In 2019, Spears announced an indefinite career hiatus and was later admitted involuntarily into a mental health facility by her conservator, leading to a court-led investigation into malpractice conducted by Spears's team.