Tonight (I'm Fuckin' You), stylized as Tonight (I’m F**kin' You) (single) and Tonight (I'm F***in' You) (Euphoria, Collector’s Edition), and also known as Tonight (I'm Lovin' You) or simply Tonight in clean versions, is a song by Spanish singer Enrique Iglesias. It features American rapper Ludacris and producer DJ Frank E. The song was released to US radio on 1 November 2010, as the album’s second US single, and digitally on 22 November 2010. The clean version of the song was included on the French Limited Edition of Euphoria. The official remix features American rapper Pitbull.

"Tonight (I'm Lovin' You)" was a worldwide hit for Iglesias, peaking at number 4 on the U.S. Billboard Hot 100, making it his highest charting single on the chart since 2010's "I Like It." The song also reached the top ten in Australia, New Zealand, and the United Kingdom, among other major music markets. The single has sold over five million copies worldwide to date.

Matthew Wilkening from AOL Radio Blog said that the song "aims directly for the dance floor with a galloping, club-ready dance beat, along with an insistent, heavily synthesized keyboard zipping all over the place. [...] Enrique’s slightly processed vocals drip with confidence, and depending on which version you hear, a healthy dose of profanity as he demands some loving". Erica Y. Lopez from Fox News Latino said "With the star power Iglesias brings to the table and a very danceable beat accompanying the track, it is conceivable that the clean version would be a hit in its own right -- but add one of the heaviest cuss words in the English language [...] it is basically club ready".

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