Jennifer Lopez celebrates her 'ride or die' younger sister Lynda Lopez's birthday with heartfelt speech

Jennifer Lopez is getting loud about her love for her younger sister, Lynda Lopez.

Over the weekend, J.Lo, 51, and rekindled love Ben Affleck, 48, celebrated Lynda's 50th birthday at Nobu in Malibu, California, alongside the 'Let's Get Loud' hitmaker's two children, 13-year-olds Max and Emme, whom she shares with Marc Anthony, her ex-husband, and some friends.

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While Affleck and J.Lo's PDA may have initially caught the attention of fans and the media, there was still plenty of love to go around.

Taking to Instagram, J.Lo wrote a heartfelt birthday message to her sister in commemoration of her 50th birthday, which was accompanied by photos of the two of them together and the hashtag #TrueLove.

"My baby sister…I love you…you are and have always been my original bestie…my partner in crime, my ride or die," the 'Jenny from the Block' songstress wrote.

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"The one who has always celebrated me in the good times and encouraged me in the tough ones.

"You are a brilliant, shining angel on earth with a pure heart and a genuinely beautiful soul.

"You deserve all the best things in life and on your birthday I wish you peace, health, happiness, success and most importantly…all the love your heart could ever desire. Happy birthday [Lynda Lopez]!!!!!"

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J.Lo's post also uses the hashtag #IfYoure26Im28, which is a reference to a joke the sister duo made in a video posted to the Second Act star's Instagram story.

In the video, J.Lo cheers for her sister as Lynda shows off a "giant baby photo" of herself.

Lynda jokes that she is turning 26, to which J.Lo quips, "Then I'm 28."

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In another video posted to J.Lo's Instagram story shortly after, followers can see both sisters in tears as the Hustlers star gives a heartfelt speech.

"We just will always be here for each other," followers hear J.Lo say, as the video shows the 'Love Don't Cost a Thing' singer with her arm around her "baby" sister.

"But today, we celebrate [Lynda]," J.Lo says, before choking up and looking at Lynda.

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"We celebrate [Lynda] because [she is] an amazing, talented, beautiful, gorgeous, angel from heaven."

"And I'm so lucky to have you as my baby sister, and my best friend for 50 years," she concludes.

J.Lo and her sister then embrace each other before the story — which Lynda has re-posted to her own Instagram page — ends.

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J.Lo is known for being extremely close with her family.

She is a middle child, with Lynda being the youngest while their other sister, Leslie Lopez, is the oldest. The three girls grew up sharing a bedroom.

While Leslie is private about her life, her child, Brendon Scholl, made headlines after J.Lo boasted about their accomplishment in being chosen to represent their school at the Global Young Leaders Conference in 2017.

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"This is Brendan my sister Leslie's second child!! They were the one person selected to represent their school at #globalyoungleadersconference in Washington DC!!!" J.Lo wrote on Instagram.

"And I couldn't be more proud!!! Brendan is strong and smart and loving and obviously a leader!! Titi Jenn loves you!!"

J.Lo's use of the gender-neutral pronoun, they/their, was quickly noticed, and Scholl later spoke at TrevorLIVE in 2018 and was profiled by the New York Post, detailing their coming out journey.

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Lynda, meanwhile, is famous in her own right.

Lynda is a New York-based Emmy-winning journalist and author, who published her book AOC: The Fearless and Powerful Resonance of Alexandria Ocasio-Cortez in 2020.

She is also an actor and producer, joining her older sister J.Lo in 2019's Hustlers, which she executive produced.

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J.Lo's 76-year-old mother, Guadalupe Rodríguez, meanwhile, has played an integral role in the Bennifer renaissance.

Last week, Rodríguez was seen spending time with J.Lo's Justice League boyfriend in Las Vegas, apparently making a cameo in one of Affleck's new projects.

A source told People that "in the past, Jennifer's mom and Ben were very close."

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"Guadalupe loved Ben. She was sad when they couldn't work things out years ago. She is thrilled that they are back together now."

"Jennifer is very close with her mom. It's very important to her that the person she is with, gets along with her mom," the source said.

"Jennifer loves that Ben and Guadalupe hung out in Las Vegas. They both love gambling and had fun together at the Wynn hotel."

J.Lo and Affleck were first thought to be rekindling their romance in April, after the songstress' split from ex-fiancé Alex Rodriguez.

They previously were in a relationship from 2002 to 2004.

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