Is Michael Jackson's Estate At War with Janet Jackson?

Janet Jackson's new album, Number Ones, is in stores today, and now a source is telling ET that the estate for the late Michael Jackson is at war with Janet over one of the songs on the album.

The song in question is called "Make Me" and features a lyric that reads, "Don't stop till you get it up." The source has told ET that Michael's estate is questioning Janet's right to use the lyric because of its similarity to his song "Don't Stop 'Til You Get Enough," featured on Michael's album Off the Wall.

We've reached out to Janet's camp, who have not yet responded, while the attorneys representing  Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal" mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:"" mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman" mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} the estate's special administators John Branca and John McClain tell ET they are unaware of it and will get back to us.