EXCLUSIVE

Who KNOWS where his mouth's been??? At least that's Lindsay Lohan's explanation for shutting down a "Scary Movie 5" kissing scene between her and Charlie Sheen -- saying she refused to lock lips with him in the movie because of his spotty history.

Sources

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Madonna made a serious threat to a bunch of her cigarette-smoking fans in Chile last night ... PUT OUT YOUR BUTTS ... OR I'M NOT GONNA PERFORM!!

It all went down during a sound check for her concert at an open-air theater in Santiago ... when some secondhand

EXCLUSIVE

Kim Kardashian is afraid Instagram's new policies will torpedo the million-dollar empire she's spent years building -- and THAT'S why she's threatening to drop the photo-sharing app ... Kim tells TMZ.

Kim was out in L.A. yesterday when we asked about her tentative plans to bail on

While Jessica Simpson was probably off somewhere trying to elude photographers from catching a glimpse of her maybe baby bump, her fiancé Eric Johnson and adorable first baby Maxwell went shopping on Melrose Avenue in L.A. on Tuesday.

It must be really hard to get Jess a Christmas gift when you