Madonna's Daughter -- Drinking At Mom's Concert Because ... Well, Her Mom's Freakin' Madonna!

Madonna's daughter let loose like her superstar mom in Detroit this week, chugging beers in the front row at Madge's concert -- and all we gotta say is we're jealous.

We're told 18-year-old Lourdes Leon showed up at Madonna's "Rebel Heart" show Thursday night with a group of her friends and sat down in the front row. It wasn't long after when Lourdes cracked open a cold one and slugged away.

While drinking at 18 is obviously against the law, we still gotta admit ... boozing front row at one of the biggest acts of all time is pretty sweet. Especially if it's your mom.