Jamie Lynn Spears Engaged: Shows off her huge rock

They’ve been dating for three years and now Jamie Lynn Spears’ boyfriend has finally popped the big question.

The 21-year-old actress and singer revealed the happy news on Saturday via her Twitter account.

The younger sister of pop star Britney Spears teased the announcement with picture of the couple, filtered through Instagram with the caption: ‘Guesssss what??????’

She also shared a photograph of the piece of jewellery her 30-year-old beau got her, writing alongside it: ‘:) #hedidgood.’

Jamie Lynn recently posted some snaps of her new fiance and her four-year-old daughter Maddie.

The former star of Nickelodeon's Zoey 101 took time out of her career to focus on motherhood after falling pregnant as a teen.

Huge rock: The actress and singer flaunted her massive diamond on Instagram

Showing him off: The 21-year-old has been sharing snaps of herself with her beau online recently

Jamie Lynn split from her fiance and Maddie's dad Casey Aldridge in March, 2009, just nine months after their daughter was bo. 

While shunning the spotlight all these years, Jamie Lynn now feels she's mature enough to take another crack at the music business. 

She moved to Nashville, Tennessee in 2011 to forge a new career and started performing on the country music circuit in America’s southe states.

PDA: She shared a photo of herself planting a smooch on his cheek

Soon to be step-dad: Jamie Lynn's love has been bonding with her daughter Maddie

Her relationship news comes just two months after her older sister's broken plans to walk down the aisle for the third time.

Britney, 31, has been married to friend Jason Alexander and dancer Kevin Federline, with whom she has two children.

She was due to get hitched to Jason Trawick but they parted ways in January 2013.

Famous sibling: Her old sister is pop star Britney Spears who is newly single