It's not the first time Alli's opened up about her brother's romance, and it sounds like it definitely won't be the last, after she told Daily Mail the blonde siblings are "happy" to talk about their private lives.
"It's something you have to get used to, it just comes with it," she said.
"We're doing this as a job, being in the entertainment industry."
Speaking to WHO in early November, Alli also revealed the extent of her bro's feelings.
“Whoever’s making Cody happy, I’m all for it, and he’s so happy right now. I’ve never, never seen him like this.”
To be fair, though, it's not as if Cody's trying to hide his emotions!
“She’s the best girl I’ve known my whole entire life,” he told WHO of 26-year-old Miley, who announced her split from husband Liam Hemsworth in August.
“I’m very happy. She’s the exact everything I want in a woman."
In fact, Alli's been the top go-to for the latest updates on all things Miley+Cody!
“They’re so similar and they love all the same things,” she spilled at the Reef Oil Yacht Girl summer party on November 16. "[Cody and I] are used to have our relationships scrutinised having grown up in the spotlight. If Cody is happy, then we are happy.”
Meanwhile, Alli is in her very own love bubble with her actor beau of almost six months, Mitchell Bourke.
“We went from zero to 100 real quick,” she told WHO. “We’re super in love. It feels like we’ve known each other forever."