United Kingdom, April 25 -- Jamie Lynn Spears has reflected on the "bittersweet" moment of her daughter graduating high school.

The 35-year-old actress was just 17 years old when she gave birth to her eldest child Maddie - who she has with ex-boyfriend Casey Aldridge - and now the teenager is the same age and preparing to leave school, the Zoey 101 star has looked back on the ups and downs of motherhood and how grateful she is to have experienced them.

Sharing a series of photos of Maddie, now 17, over the years, Jamie Lyn wrote on Instagram: "Welp..the grad invites are sent, the cap and gown arrived, and the last regular day of school is here..I guess the lovely state of denial that I forced myself to be in has to end, bc the reality o...