At the age of three, she was discovered by a talent agent while singing and dancing at the Los Angeles restaurant Taste of L.A. Cosgrove stated that when the agent approached her and her mother for modeling, she had "never really thought of being an actress" and "was lucky".
Pada usia tiga tahun, ia ditemukan oleh seorang agen pencari bakat ketika menyanyi dan menari di restoran Los Angeles Taste of L.A. Cosgrove menyatakan bahwa ketika agen mendekatinya dan ibunya untuk pemodelan, ia "tidak pernah benar-benar memikirkan menjadi seorang " dan "beruntung".