Jennifer Lopezis now 50 and, as always, her fiancéAlex Rodriguezis supportive as ever!

The former Yankees star, 43, posted a sweet video montage for Lopez on Instagram for her birthday, pouring his heart out while candid videos of his fiancée play in the background to the tune of Billy Joel’s “This Is The Time.”

“Thank you for your passion, and your energy, and your inspiration, and your endless pursuit to be the best at everything that you do,” he added. “You are simply the best partner in life, the best daughter, the best mother, the best performer. We love you, your fans love you, your children love you and I love you. Let’s make this birthday a very special one.”

Alex Rodriguez and Jennifer Lopez with their children.Instagram/Jennifer Lopez

Jennifer Lopez, Alex Rodriguez

On his Instagram Stories, the former MLB player also shared a video of the “Medicine” singer reading birthday wishes written on a card so large it towered over her.

“That’s amazing,” she can be heard saying of the card in the video.

Alex Rodriguez/Instagram

JLo birthday card

Pop star Lopez is touring behind her birthday on theIt’s My Partytour. A-Rod and their four children — Lopez’s twins Maximillian and Emme, 11, (with ex-husband Marc Anthony) and Rodriguez’s daughters Natasha, 14, and Ella, 11 (with ex-wife Cynthia Rodriguez) —showed upat her Madison Square Garden performance earlier this month.

When the New York City blackout cut Lopez’s performance short, the four childrendanced and sangto comfort her. “How great are our kids?” she asked Rodriguez in a video she posted. (She rescheduled the concert for two days after the blackout.)

Lopez also stars in the upcoming stripper dramaHustlers, and director Lorene Scafaria toldVulturelast week that Rodriguez went with Lopezto a strip clubto get “insights” for the movie.

The couplegot engagedlast March, when Rodriguez popped the question on a Bahamas vacation. Lopeztold PEOPLE afterward, “We’re really happy.” “We have [an] appreciation for where we are in our lives today, and that’s what we’re enjoying the most,” Rodriguez added.

RELATED VIDEO:Jennifer LopezShares Sweet Tributes to Both Alex Rodriguez and Marc Anthony on Father’s Day

Asource told PEOPLEin May the couple “are not doing a huge wedding” and may instead opt for “a small family celebration that will, of course, include all four kids.”

The two began dating in February 2017, and sourcesconfirmed their relationshipto PEOPLE that March.

source: people.com