Britney Spears posts surprising tribute to ‘inspiring’ sister Jamie Lynn Spears

From the bottom of her broken heart.

Britney Spears made the internet do another double take Friday night — on the singer’s 41st birthday — after posting a tribute to her estranged sister Jamie Lynn Spears, 31.

“It’s my b-day but you’re my heart so I’m thinking about you …,” the pop star wrote.

Adding, “Congratulations on being so brave, inspiring, and showing guts and glory in your show !!!. You ain’t alone … if anybody knows what that feels like … I get it. My baby sister !!! I love you !!!”

The emotional post featured two images of the “Zoey 101” star — one of the younger Spears playing guitar while the other one was a posed photograph.

The snaps took the internet for a loop following the siblings’ longtime, very public feud.

In January, Jamie Lynn received a cease and desist letter from Britney’s attorney ahead of her book tour for her memoir, “Things I Should Have Said.”

The super-star attorney, Mathew S. Rosengart, penned a letter to Jamie Lynn, calling the memoir — which was released just two months after Britney was freed from her 14-year conservatorship controlling her personal, medical and financial affairs — “ill-timed” with “misleading or outrageous claims.”

“Although Britney has not read and does not intend to read your book, she and millions of her fans were shocked to see how you have exploited her for monetary gain. She will not tolerate it, nor should she,” wrote Rosengart.

Following a clapback from Jamie Lynn, the “Piece of Me” hitmaker took to Instagram multiple times to call her sister “scum,” as well as saying in a swiftly deleted post that she “should have slapped” her “selfish little brat” sister and mother, Lynne.

Amidst the back and forth, however, Jamie Lynn posted to Instagram stating that the social media accusations haven’t matched up to what the sisters discussed in private.

“Brit, I am always here for you, you know behind the scenes I have always been here. It’s become exhausting when conversations and texts we have in private don’t match what you post on social media,” she wrote.

The singer has previously criticized other family members — including dad Jamie, mom Lynne and brother Bryan Spears — for their roles in the restrictive legal arrangement that she has called “abusive.”