Spoiler alert! The following story contains major details about Episode 6 of "Sex and the City" sequel series "And Just Like That…" (now streaming on HBO Max, new episodes Thursdays). NEW YORK — Somewhere between the antacid tablets and protein shakes, Charlotte York hit her breaking point. In Season 3's sixth episode of "And Just Like That…," released July 3, Carrie Bradshaw (Sarah Jessica Parker) spots her best friend Charlotte (Kristin Davis) trying to go incognito in Walgreens, where she's shopping for Depends. Asked why she needs adult incontinence underwear, Charlotte tearfully reveals that they're for her husband, Harry (Evan Handler), who has recently been diagnosed with prostate cancer but doesn't want anyone to know. "Oh, honey, honey. Here, sweetie, look at me," Carrie says, grabbing Charlotte's hand. "You tell me anything, alright? Any thought, big or small. I will not tell a soul. I promise, I'm your vault." "They found it early, but I can't stop thinking that he's going to die," Charlotte admits, her voice cracking as she breaks out in sobs. "That's why I've been such a mess." 'And Just Like That':Samantha returns with offscreen 'cameo' in Season 3 The emotional episode ends with Carrie holding Charlotte as she bawls in her arms. It's a tender, unvarnished moment that harks back to the very best of HBO's "Sex and the City," when Carrie and Charlotte supported their pal, Samantha Jones (Kim Cattrall), through breast cancer, and Miranda Hobbes (Cynthia Nixon) helped her on-and-off-again beau, Steve (David Eigenberg), through testicular cancer. "I was really worried about that scene," says Davis, who tested positive for COVID the morning she was supposed to shoot it. The poignant exchange was postponed for several months, until the very end of filming, meaning "I had to go back emotionally to where I had been on that day." For any actor, "that's always hard when you know you have a scene like that and it keeps getting pushed," Parker says. "What you really want to do is shoot the scene and be done with it, when you have something that is going to require you to feel so vulnerable and cry. But she did a beautiful job." Michael Patrick King, who created "And Just Like That…," says that the costars' real-life friendship helped bring gravity to "a very scary moment" for Charlotte. "Because Kristin and Sarah Jessica have worked together for so long, the trust is there," King says. "In that scene, Kristin really just lets go, and Sarah Jessica is there holding her." As the season goes on, Charlotte's storyline unfolds "in really funny and unexpected ways," Davis teases. "Carrie throws Charlotte a birthday party to cheer her up and everything unravels. Charlotte has also been holding in so much, trying to keep everything going while she takes care of Harry. She hasn't really been taking care of herself, so she ends up having some health issues that end in a comedic way, thank God." Elsewhere in the episode, Charlotte's new friend, Lisa (Nicole Ari Parker), unexpectedly loses her dad (Billy Dee Williams) to a stroke. In the days to follow, Lisa clashes with her thespian stepmom (Jenifer Lewis) about the over-the-top funeral arrangements. "I grew up (watching) Billy Dee Williams, so I was very sad in real life that we wouldn't do any more work together in this series," Parker says. Lewis, meanwhile, is "a blazing talent. God didn't give me a voice, but when I'm with Jenifer Lewis, she lets you believe you can sing. So we'd have dance breaks (on set) – she's just iconic and larger than life." This article originally appeared on USA TODAY:Sarah Jessica Parker, Kristin Davis get 'vulnerable' in 'AJLT' episode