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She landed her first major breakthrough as a songwriter, co-writing Rihanna's song "Cheers (Drink to That)" featured on Rihanna's fifth studio album Loud, released on 12 November 2010 on Def Jam Recordings. "Cheers" features a vocal hook performed by L.P. (taken from Avril Lavigne's "I'm with You"). In a 2010 interview with MTV News, Rihanna said: "I love that song ['Cheers']. That is one of my favorite songs on the album. It makes you feel like celebrating. It gives you a great feeling inside like you want to go out and have a drink. ... People can't wait for the weekend."

L.P.'s major label songwriting breakthroughs continued, as she co-wrote "Beautiful People" performed by Christina Aguilera. The song is featured on the Burlesque: Original Motion Picture Soundtrack album, which was released on 22 November 2010 through RCA Records. In June 2011, L.P. co-wrote "Afraid to Sleep" which was performed by NBC's The Voice finalist Vicci Martinez and reached #10 on iTunes Top Singles Chart.