Pop icon, Madonna's 18-yr-old daughter, Lourdes Leon, was caught drinking beer in the front row of her "Rebel Heart" concert in Detroit last week Thursday.

Read: Pop star's 57th birthday gets police attention

Leon was spotted taking a swig of beer from a can of Bud Light, an American alcohol brand.

The teenager looked like she was used to drinking alcohol.

Meanwhile, its no news that drinking at 18 is against the law in the US.

Leon is the first of 4 kids the pop star has, including siblings, David Banda Mwale Ciccone RitchieRocco RitchieMercy James.

Read: Pop star's daughter turns down Kylie Jenner's friend request

See photos in Pulse gallery.