"I would not have posted it if I had thought it would have upset you but I realise it has and for that I apologise," the British actor and comedian wrote on Instagram.

Millie Bobby Brown, a former child actor with so much personality at a young age, rose to prominence by playing Eleven on Stranger Things. These days, Brown, who just celebrated her 21st birthday, continues to navigate her professional and personal lives.

After Millie Bobby Brown called out Matt Lucas for commenting that she had a "mommy makeover," the comedian shared a heartfelt apology to the Stranger Things star and clarified his remark.