Dwyane Wade & Gabby Union -- Pre-Wedding Beyonce Concert

Dwyane Wade channeled his inner-Gronk ... and hit up the Beyonce & Jay Z concert in Chicago last night with wife-to-be Gabrielle Union.

B&J were playing at Soldier Field -- home of Da Bears-- where Michelle, Sasha and Malia Obama were reportedly in attendance.

No word if Wade and the Obamas hung out at the show -- but we know they're friends ... Dwyane even shot a commercial with Michelle earlier this year.

As we previously reported, Dwyane and Gabby are set to get married next month -- but have issued a social media BAN at the reception.

Interestingly enough, D-Wade tweeted and Instagrammed at the show last night -- bragging about how they got backstage after the concert.