Star vs. the Forces of Evil - Eclipsa with little Meteora on her arms.

Eclipsa's cute little monster.

Im in the camp that Eclipsa had a child with the Mewman king, But because of the All Seeing Eye spell, she saw him cheat on her or do something horrible. She then ran away after falling in love with a monster, and had Meteora. The full mewman daughter took the throne, while Meteora became Miss Heinous for her own protection.