The retired baseball star was pictured inspecting the bright red sports car - believed to be the 2019 Porsche 911 GT3 - when it was delivered with a giant yellow ribbon on the hood, and later stood by proudly as his girlfriend got behind the wheel of the vehicle.
According to TMZ, cameras were rolling when Jennifer took the flash new ride out for a spin on Wednesday (24.07.19), hours before her star-studded birthday party took place.
The 'On the Floor' hitmaker celebrated her milestone ag with a glamorous bash at Gloria and Emilio Estefan's estate on Miami's Star sland
There was a special performance from Jennifer's 11-year-old twins, Max and Emme - who she has with ex-husband Marc Anthony - who serenaded their mom with a rap and a song.
Guests at the bash - which also included rapper Fat Joe and his wife Lorena Cartagena - rounded off their evening with a spectacular fireworks display.
As well as buying his girlfriend a car, Alex also shared a touching montage on Instagram to mark Jennifer's birthday.
He shared a black and white clip composed of images of him with Jennifer and each of their children, Max and Emme and his own daughters Ella, 11, and Natasha, 14, whom he has with ex-spouse Cynthia Scurtis.
He captioned the video, which was soundtracked by Billy Joel's 'This Is The Time' : ''#HappyBirthdayJLO
It's your party, Jennifer!
Thank you for inviting all of us to share this special day with you. (sic)''
An emotional Jennifer commented: ''I'm crying....I love our life...I love you so much... thank you my beautiful Macho... (sic)''
What's new in the music world this week?
'Sounds of Silence' was released on this day (January 17th) in 1966.
Listen to Alex Bayly performing 'Animal'.
Two weeks ahead of Independent Venue Week, Dry Cleaning made 'Britain's Best Small Venue 2015' (NME) the second port of call on their 2020 tour.
'Leave Home' was released on this day (January 10th) in 1977.
For their last gig of the year, The Libertines came back to their adopted hometown of Margate to finish off their latest tour.
Celebrating the birthday of David Bowie with his most legendary songs.