"She would definitely get a strong, solid seven (out of 10). A seven's really good. She doesn't have the biggest voice in the world, but she can sing. It's the package - look at Britney (Spears), Ke$ha, (Lady) Gaga, they're not like my girl Mariah Carey." American Idol star Randy Jackson might have some explaining to do after questioning fellow judge Jennifer Lopez's star credentials during an appearance on late-night chat show Jimmy Kimmel Live! on Tuesday (18Jan11).