Jamie Lynn Spears celebrated her birthday with a message to Justin Timberlake, who’s jamming to his music and finally understands its meaning. Apparently.

She Tweeted (with the above photo):

@jtimberlake Weird hearing ur music as an Adult ha..Not only do I appreciate it.I GET it #jay #crymeariver #mirror

Later, the birthday girl deleted her previous tweet and tweeted a follow up.

I hope you all know that my tweets are only to support my sister@britneyspears - anything left over was to @jtimberlake #sisterlove #4eva

— Jamie Lynn Spears (@jamielynnspears) April 5, 2013

April 4 is Britney’s little sister Jamie Lynn Spears birthday!

From Britney Spears’ twitter:

Happy 22nd Birthday to my beautiful baby sister @jamielynnspears! Love u & miss u already!

Wish her a happy birthday from twitter (@jamielynnspears)

APRIL 1, 2013 - BRITNEY AND JAMIE LYNN OUT AND ABOUT IN LOUISIANA

Britney and her sister enjoy the easter holiday in their hometown

BRITNEY’S PRIVATE PHOTO LEAKED

Check out the new-never-before-seen pictures of Britney spending christmas with her family in Louisiana last year.

Britney Spears recently took off her engagement ring, but her little sister has just put one on.

Jamie Lynn Spears, 21, plans to marry Jamie Watson, 30, and showed off her engagement ring in an Instagram photo posted to Twitter on Saturday..

Guesssss what?????? instagr.am/p/WYOrwxkAlw/

— Jamie Lynn Spears (@jamielynnspears) March 3, 2013

She later added: “#blessed #blessed #blessed.”

Britney sent good wishes to Jamie Lynn via Twitter:

“So excited and happy for my sister, congrats @jamielynnspears - love you.”

The couple have been dating for about three years. Jamie Lynn was previously engaged to Casey Aldridge, the father of her 4-year-old daughter, Maddie. They split in 2010.

Britney’s younger sister starred in Nickelodeon’s “Zoey 101” from 2005-2008 and has expressed interest in starting a career in country music.

Britney and her fiance, Jason Trawick broke off their engagement two months ago. They started dating in 2009 and got engaged in 2011.

NOVEMBER 25, 2012 - BRITNEY WITH SEAN, JAYDEN, AND JAMIE LYNN SHOPPING IN THOUSAND OAKS

Britney with My-Favorite-Boys and her sister, Jamie Lynn shopping at Target in Thousand Oaks on Sunday (Monday WIB)

Britney Spears continues to be a big inspiration for her niece Maddie.

On Tuesday (Wed WIB), Britney’s little sister Jamie Lynn shared a photo of her four-year-old daughter dressed in a schoolgirl outfit meant to imitate Aunt Britney’s famous outfit from the “…Baby One More Time” video that launched her to superstardom in the late 1990s.

Maddie’s costume was part of “Celebrity Day” at her school.

Last year, the little girl covered her aunt’s song “Up N’ Down” in a video uploaded by Britney herself.

She might have a future in the family business!