After dating for a little over a year, musician Mod Sun proposed to girlfriend Avril Lavigne in front of the Eiffel Tower in Paris in late March. They confirmed the engagement after Lavigne was photographed entering a recording studio with a sizable diamond ring on her ring finger. Mod Sun shared a photo on Instagram of the moment he was on one knee and even composed some rhyming couplets for the caption. “The day I met I knew you were the one. Together forever til our days are done,” it began. Mod Sun, full name Derek Ryan Smith, most recently had a whirlwind relationship with Bella Thorne, w…