Johnny Depp has seen intimate details of his marriage to Amber Heard play out in the courtroom in his high-profile defamation case.MORE: Johnny Depp and Amber Heard trial: The most explosive moments so farAnd it's no doubt proved to be a particularly difficult time for his two children – Lily-Rose Depp, 22, and her younger brother, 20-year-old Jack. WATCH: Johnny Depp testifies in court against Amber HeardWhile the siblings have understandably been keeping a low profile, Lily-Rose did take to Instagram on Sunday in celebration of her mother, Vanessa Paradis.READ: Decoding Amber Heard's courtroom looksMORE: Johnny Depp's $100m property portfolio revealedLily-Rose posted a throwback snapshot of her mom to mark Mother's Day, adding a red love heart as she posted it to her Stories.