She's looking forward to the birth of her third child. But newly pregnant Britney Spears made sure to keep fans guessing as she posed naked on social media - using her adorable dog Sawyer as a bump cover-up.The pregnant star, 40, hid her stomach area by cuddling the pup to her front as she beamed at the camera in the cheeky snaps, wearing nothing but jewellery and makeup with a diamond emoji covering her behind. The Baby One More Time singer is expecting her first child with fiancé Sam Asghari, 28.