Miley Cyrus took to Instagram to wish her older sister Brandi Cyrus a happy birthday.

The pop star shared several pictures of her and her sister at a March 26 Cleveland Cavaliers versus New York Knicks game with drinks in their hands.

"PS as you slide [through] these next few photos it will become very clear as to why I no longer drink," the "Malibu" singer wrote.

She then jokingly added, "Or maybe why I should start again."

An error occurred while retrieving the Instagram post. It might have been deleted.

Cyrus recently opened up to Billboard about leaving her partying ways behind her.

"I haven’t smoked weed in three weeks, which is the longest I’ve ever [gone without it]. I’m not doing drugs, I’m not drinking, I’m completely clean right now! That was just something that I wanted to do," she told Billboard May 3.

She said her decision to give up marijuana was because she wanted to be "super clear and sharp."