Britney Spears, 40, is back on Instagram! The “Toxic” singer raised eyebrows when her account mysteriously appeared deleted on Wednesday, March 16 but triumphantly returned just two days later. Britney left little to the imagination with a sheer white crop top with nothing underneath, showing off her toned abs. She paired the thin t-shirt with a navy blue tennis style skirt made out of a luxe velvet, and a camel colored pump.