The Hold Me Closer singer Britney Spears celebrated her forty first birthday by sending well-wishes to her sister Jamie Lynn Spears and her sons Sean Preston and Jayden James in a sequence of Instagram posts shared on Saturday. “It’s my b-day but you’re my heart so I’m thinking about you,” Britney captioned a sequence of photographs of Jamie Lynn. “Congratulations on being so brave, inspiring, and showing guts and glory in your show. You ain’t alone … if anybody knows what that feels like …”