Jamie Lynn Spears

Jamie Lynn Spears

Jamie Lynn Spears serenaded her daughter at a music festival for her birthday.

The 23-year-old singer helped her little girl Maddie celebrate turning six in style on Thursday (19.06.14), by bringing her on stage and singing 'Happy Birthday' with help from her fans at the Country Jam 2014 preview in Grand Junction, Colorado.

The country singer's proud older sister, Britney Spears, who has two sons, Sean, eight, and Jayden, seven, posted several videos of the performance on Instagram, with the caption: "Wishing a very Happy 6th Birthday to Princess Maddie!! Wish I was there to sing Happy Birthday to u (sic)."

Jamie Lynn later responded: "We wish you and the boys were here too!!!"

'Piece of Me' hitmaker Britney, 32, also shared a second clip of her niece, wearing a princess gown and singing at home, and wrote: "Sing it Maddie!!! Loving all the bday videos @jamielynnspears has been sending me today :) So cute! (sic)"

Jamie Lynn recently claimed that her famous sibling was like a "second mother" to her when they were growing up.

She said: "There's such a big age difference between me and my sister that I think [she] almost was like a second mom.

"She's so supportive and she's so encouraging of me and she's like my biggest fan... She's always had my back."