This study aimed to explore English code-mixing in Thai Luk Thung pop dance songs sung by Kratae R-Siam and Baitoei R-Siam, two female singers under RS Public Company Limited. The study focused on an analysis of twenty (20) songs in which English code-mixing was found. Data were analyzed using the framework of Kannaovakun and Gunther (2003) and Ho (2007). The results showed that the songs contain a total of forty-six English words. In terms of nativization of English based on Kannaovakun and Gunther (2003), 26 words meet the nativized features. The highest frequency was displayed by truncation (42.31%), followed by reduplication and semantic shift (19.23% each), hybridization (15.23%), and word order (3.85%), respectively. Based on Ho’s (2007) classification framework, the highest frequency was displayed by lexical words (48.57%), followed by short forms (31.42%), proper nouns (14.29%), and single full sentences (5.71%), respectively.