Lady Gaga
In 2015, Gaga was supposed to be the artist to perform the first concert in space; however, this never came into fruition.  She performed a tribute to British singer-actress Julie Andrews at the 2015 Academy Awards. Gaga became engaged to her boyfriend of nearly four years, actor Taylor Kinney, over the weekend of Valentine's Day, 2015.  However, the couple broke up in July 2016.