The singer and the actor announced their engagement after four years of dating on Sunday

Advertisement
Britney Spears
Britney Spears and Sam Asghari
| Credit: Sam Asghari Instagram

Britney Spears is feeling "Lucky!"

After her longtime boyfriend Sam Asghari, 27, popped the question at her Los Angeles home on Sunday, a source close to Spears, 39, tells PEOPLE exclusively the singer is thrilled about her future with the actor.

"Britney is ecstatic," says the insider of the pop star, who giddily showed off her brand-new diamond ring on Instagram.

Spears and Asghari — who first met on set of her 2016 "Slumber Party" music video — "are deeply touched by the support, dedication and love expressed to them," the fitness enthusiast's manager Brandon Cohen told PEOPLE in a statement.

Cohen added that Spears' new bling was designed by NY.C. jeweler Roman Malayev.

For more on Britney Spears and Sam Asghari's engagement news and other top stories, listen below to our daily podcast PEOPLE Every Day.

RELATED VIDEO: Britney Spears Raves Over 'Adorable' Emma Stone's Cruella, Says She Watches It '3-4 Times a Week'

In August, she praised her future husband on Instagram for helping her through the "hardest years of my life."

After an explosive court hearing earlier this summer, a friend of the couple told PEOPLE Asghari and Spears have long been ready to settle down together.

"He's ready for marriage and kids with Britney and is serious about the relationship. She wants to take that next step and have that full life with him," said the friend. "As a couple they've hidden how they've really felt even from people close to them because they were anxious and scared, but now it's all out there."