The troubled teen posted a pic of them both snuggling up, with the caption: "What did I do mom ;) love u"
Earlier in the day, the 19-year-old revealed he had been in the recording studio with his mum.
"Got my moms courage enough to get in the booth for the first time she sounds so good :)," he wrote.
Is a mother-son collaboration on the cards?
Listen to Patti sing in Justin's Instagram video below:
After Justin was recently arrested for DUI in Miami, a source close to Pattie allegedly told E! News: "As any caring mother would be, Pattie is genuinely concerned for Justin, and she has said in many interviews before that she doesn't have her head in the clouds and keeps in very close touch."