Don’t age yourself, Britney Spears! The Princess of Pop, 42, appeared surprised by how “young” she looked in a few photos shared to Instagram on Monday, August 26. “This was two years ago, I look extremely young here … kinda weird !!!” Spears declared in the caption of the post — which featured several similar images of the “Toxic” singer making a pouty face at the camera while standing outside in a white button-up shirt and black makeup circling her eyes. Spears continued: “I like these pics because I’m wearing my favorite necklace my hairdresser gave me !!! It’s from an expensive boutique,…