Jennifer Lopezis the “happiest she has ever been” withAlex Rodriguez, a source tells PEOPLE.

“They are incredible together. Very much soulmates that bring out the best in each other and are so supportive of each other,” the source says of thenewly engagedcouple.

“From the start, they moved very quickly. Their relationship was always very passionate. Jennifer quickly fell very hard for Alex. And she quickly started planning for the future,” the source says.

Lopez and ex-husbandMarc Anthony, 50, have 11-year-old twinsMaximilian “Max” David and Emme Maribel, while Rodriguez, 43, and ex-wifeCynthia Scurtis, 46, share daughtersElla, 10, and Natasha, 14.

Jennifer Lopez, Alex Rodriguez and kids.Jennifer Lopez/Instagram

https://www.instagram.com/p/BuMngQ6gQ2b/Jennifer Lopez/Instagram

The singer and the former MLB player announced their engagement news on Saturday, shortly after Rodriguez popped the question during the couple’sromantic getawayto the Bahamas.

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2018 MTV Video Music Awards - Red Carpet

“She said yes,” Rodriguez wrote alongside aphotoof Lopez wearing herstunning diamond engagement ring. Sharing the same image, Lopez simply captioned the romantic snap with eight black heart emojis.

“Jennifer is ecstatic and so are their families and friends. Very few people knew Alex planned on proposing. It was very much a surprise for Jennifer,” the source tells PEOPLE. “It was just how Alex wanted it.”

Jennifer Lopez and Alex Rodriguez.Jennifer Lopez/Instagram

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Opening up to PEOPLE last December, Lopez shared that before finding love with Rodriguez, she had to do somereal soul-searchingto figure out why she seemed to repeat unhealthy patterns with men.

In the wake of her divorce from Anthony in 2014, Lopez said she was “done blaming other people —hedid this orhedid that — and I said to myself, no, it’syou.”

“Until I could really learn to be happy on my own and love myself, these relationships were never going to work out, no matter what. That was a big turning point for me,” said Lopez, who also worked with a therapist to help discover what makes her tick.

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“Rei Kawakubo/Comme des Garcons: Art Of The In-Between” Costume Institute Gala - Arrivals

It was with a renewed sense of self — and with her priorities straight — that she began her relationship with Rodriguez in early 2017.

“It wasn’t until I met Alex that I felt like, ‘Okay, I can be in a relationship again,'” she said, adding that the pair “bring something to each other’s lives that is profound, good and healthy.”

RELATED VIDEO:Jennifer LopezCelebrates ‘Two Years of Laughter,’ ‘Fun’ and ‘Adventures’ with Alex Rodriguez

As for what he admires in Lopez, Rodriquez previously told PEOPLE “her best quality is undoubtedly her generosity.”

“I see it every day and my kids see it as well,” he said. “Jennifer has given so much to me and my kids over the last two years.”

Opening up about the pair’sblended family, he added, “Our kids have become best friends and that keeps us both grounded and appreciative.“

“We couldn’t have asked for anything better than the four of them getting along as they do,” he told PEOPLE.

source: people.com