Career: In 1967, Parton's first hit, Dumb Blonde, impressed local TV icon Porter Wagoner so much he hired her to sing on his show. For the next seven years their duets made them country favourites. Parton's solo single Joshua hit No 1 in America in 1970, and in 1974 she began a run of eight No 1s in six years and had her own TV series. By 1980, Parton was a huge star and made her movie debut in 9 to 5 (she recently backed a musical stage version of the film). Movies since include The Best Little Whorehouse In Texas, Rhinestone and Steel Magnolias. She continues to record and tour around the world.

Career: Cyrus's big break came in 2006 when she played the lead role in the Disney Channel's teen sitcom Hannah Montana, which focused on a teenager living a double life as average schoolgirl Miley Stewart by day and famous recording artist Hannah Montana by night. The series was an instant success and ran for four seasons until 2011. She has released a number of successful albums as Hannah Montana and under her own name and toured extensively around the world.

Career: Tomlin made her film debut in Nashville (1975), for which she was nominated for an Academy Award for Best Supporting Actress. Other films followed, including 9 to 5 (1980), The Incredible Shrinking Woman (1981), All of Me (1984), Big Business (1988), Short Cuts (1993), I Heart Huckabees (2004) and A Prairie Home Companion (2006). In 1977, Tomlin became the first woman to have a solo show on Broadway, Appearing Nitely. She won a Tony Award for her performance in another one-woman Broadway show, The Search for Signs of Intelligent Life in the Universe. It was made into a film in 1991. Tomlin's TV credits include Murphy Brown, Will & Grace, The West Wing, Desperate Housewives, Damages and Malibu Country. More recently, she starred opposite Jane Fonda in the Netflix series Grace and Frankie, and on the big screen in Grandma (2015).