La Toya Jackson says her late brother Michael Jackson wouldn't be happy about the release of the documentary 'This Is It'.

Although Jackson says she's happy about the king of pop's return to the airwaves with his new 'single' 'This Is It' she said Michael wouldn't be pleased with the screening of the documentary because it's a rehearsal and not the final product, reports msnbc.msn.com.

Speaking to Access Hollywood recently Jackson said: "It's wonderful to hear something from him because he hasn't had anything out in a while."

When Access asked her if she thinks her brother would've wanted the documentary released she said: "You know what, that's a very, very, very good question. Truthfully, my opinion ? no. Michael always wants to give his best. This is a rehearsal. He wasn't giving his all. He loves to give his all always. That's just the way he is. He wants people to see him at the top of the ladder and not half-stepping because he doesn't want to do a full-out rehearsal."

Jackson also added that she'll still support the movie.

"I will support my brother in any way I can. I love him," she said.

'This Is It' is set to be released on 28 October 2009.