Britney Spears is strutting her stuff! On Saturday, the pop star, 42, shared two videos of herself while trying on some risqué outfits in a dressing room. In the first clip, the “Toxic” singer stepped out in a tight yellow off-the-shoulder minidress as she flipped her hair back and forth and smiled at the camera. “Yellow hello 🌷👗🌷👗!!!,” she captioned the footage. In the second video, Spears stunned in a sheer sparkling ensemble as she shook her hips and gave the camera a cheeky smirk. “When Ma says, ‘Aww sweet girl, you look so purtty’ I’m like you want me to show you my ass 😬😬😬!!!” the mother…