The fact that she's 48-years-old blows our mind!

J.Lo slipped into a sexy pinstriped two-piece ensemble for date night with A-Rod at celeb hotspot Craig's, and the songstress' rock hard abs make us want to do about a million crunches!

The Bronx-born beauty recently got people talking after she posted an Instagram wearing a ring on her wedding finger, but the A-list couple isn't engaged quite yet! Although...

A source tells X17:
    "Jennifer isn't worried in the slightest. She knows Alex is going to pop the question, and she's just grateful that they found each other at this stage in their lives. She thinks they're a perfect match, their kids all get along great, and they're focused on building a life together. She thinks A-Rod might propose during the next big family gathering, which will happen on her birthday on July 24th."

A-Rod should put a ring on it sooner rather than later!