Blake Lively Is 'One of the Best Humans I Know,' Says Sister Robyn in Birthday Tribute: 'Love This Girl'

"That’s my bday queen right there!" Robyn captioned a photos of herself and Blake, who turned 37 on Aug. 25

<p>Robyn Lively/Instagram</p> Robyn and Blake Lively

Robyn Lively/Instagram

Robyn and Blake Lively

Blake Lively is getting some major birthday love from sister Robyn Lively.

On Sunday, Aug. 25, Robyn shared a photo carousel of herself and her younger sister as the latter turned 37, writing in the caption, "That’s my bday queen right there!"

The first photo, a selfie, showed Blake in the background and Robyn, 52, in the foreground, as the It Ends With Us actress posed next to balloons. Subsequent snapshots included the duo posing together for another selfie, hugging on a beach and a throwback from the '90s.

"I love this girl, my sister, my best friend, my little piggy back buddy!" Robyn continued, referencing the pose in the throwback photo that showed Blake riding on her back.

"You are one of the best humans I know. HAPPY birthday sissy britches!" she concluded.

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Related: Blake Lively's Siblings: All About Her Brothers and Sisters

The actress also shared a full-length photo of the siblings in front of a beachy backdrop on her Instagram Stories, writing, "Happy birthday sissy ILY," and tagging Blake.

Robyn's posts for her sister's birthday come amid some controversy that Blake has been at the center of surrounding It Ends With Us, including buzz about tension with director/costar Justin Baldoni and accusations that the press tour for the movie has not focused enough on its themes of domestic violence.

One fan comment on Robyn's post seemed to address the controversy: "Blake is a lovely human being!! I hope she knows that the multitudes of people who love her is so much greater than the negative voices. Happy birthday Blake!!"

"Thank you for this," Robyn replied to the comment, including raised-hands and red-heart emojis.

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<p>Robyn Lively/Instagram</p> Robyn Lively's Instagram comment

Robyn Lively/Instagram

Robyn Lively's Instagram comment

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Blake and Baldoni's costar Brandon Sklenar shared a statement on Instagram Aug. 20 imploring fans to stop putting their energies into "vilifying the women" who worked on the film.

"There isn't a single person involved in the making of this film that was not aware of the responsibility we had in making this," he wrote in that statement, in part. "A responsibility to all the women who have experienced generational trauma - Domestic abuse - Or struggle with looking in the mirror and loving who they see."

It Ends With Us is now Blake's highest-grossing movie yet, with over $242 million earned globally so far since its Aug. 9 release, according to Deadline.

With that total, the romantic drama passed Blake and husband Ryan Reynolds' 2011 superhero film The Green Lantern as her top earner. (That movie made just over $237 million upon its release.)

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