Paul Hamilton Williams Jr. is an American composer, singer, songwriter, and actor. He is known for writing and co-writing popular songs performed by a number of acts in the 1970s, including Three Dog Night's "An Old Fashioned Love Song" and "Out in the Country", Helen Reddy's "You and Me Against the World", Biff Rose's "Fill Your Heart", and the Carpenters' "We've Only Just Begun" and "Rainy Days and Mondays". He also wrote "Cried Like a Baby" for teen idol Bobby Sherman.

"We've Only Just Begun" is a single by the Carpenters, written by Roger Nichols (music) and Paul Williams (lyrics). It was ranked at No. 414 on Rolling Stone magazine's list of "The 500 Greatest Songs of All Time."