Who sings a swing beat song circa 2010 with chorus L-O-V-E LOVE?

The song you're referring to is "L.O.V.E." by Natalie Cole. Released in 2006, it gained popularity and continued to be associated with the swing beat genre in the following years, including around 2010. The catchy chorus spells out "L-O-V-E," making it memorable and widely recognized.