|This article is about a phase. You may be looking for the episode.|
The phase is initially triggered by the presence of people whom the afflicted is attracted to, which causes purple hearts to steadily appear all over their body until it is fully engulfed. In Star's case, this happened whenever she was around any boy from school. This causes them to change as a whole, with differently colored skin, six arms, heightened senses, large wings capable of flight and an insatiable urge to cocoon others, mainly boys. Once mewberty is complete, the person returns back to normal, albeit with a set of tiny, vestigial wings.
At the end of Star vs. the Forces of Evil: The Battle for Mewni, Star gains a new mewberty form with six arms, an orange and gold dress and boots, longer horns on her headband, and large, golden butterfly wings. Following the events of "Deep Dive", she can control this form at will.
In Star and Marco's Guide to Mastering Every Dimension, Star describes the phase as "suddenly looking at boys as if they were made of bacon, like you've never eaten it in your life, and all you want to eat is bacon."
In at least Star and Queen Butterfly's cases, a person can morph in and out of their mewberty forms once they reach full maturity.
- According to Star and Marco's Guide to Mastering Every Dimension, only girls on Mewni go through mewberty.