Megan Fox admits being fired from the 'Transformers' franchise was the ''low point'' of her career.

The 31-year-old actress starred as Mikaela Banes in the 2007 'Transformers' movie and 2009's 'Transformers: Revenge of the Fallen', but her diva-like behaviour subsequently led to Megan being cut from the money-spinning franchise.

Reflecting on that experience, Megan said: ''That was absolutely the low point of my career. But without - 'that thing' - I wouldn't have learned as quickly as I did.''

The Hollywood star was given the chance to resurrect her future with the franchise by offering an apology - but she refused.

And in retrospect, Megan now concedes she made a foolish mistake.

She told Cosmopolitan magazine: ''All I had to do was apologise - and I refused. I was so self-righteous at 23, I couldn't see [that] it was for the greater good. I really thought I was Joan of Arc.''

Megan also opened up about her turbulent relationship with her husband Brian Austin Green, who she married in 2010.

The actress - who has Noah, four, Bodhi, three, and 14-month-old Journey with her husband - split from Brian in August 2015 before they reconciled when she fell pregnant for the third time.

Of their relationship, Megan shared: ''If you want it to last, you just have to stick it out.

''I know my karma isn't done. And so we're in it until the universe releases us. We're not completely in control of it. And he is a hunk.''

And despite being one of Hollywood's most sought-after female stars, Megan insists she wouldn't prioritise her young family over her career.

The 'Teenage Mutant Ninja Turtles' actress said, too, that she doesn't intend to be an actress ''forever''.

Megan explained: ''I would never pick work over life.

''I'm the least ambitious actress! I pick movies that'll be fun to make. I'm not here to suffer for the art of movie-making or 'bleed for the craft.' And I'm not going to be an actress forever. I've always known I have another calling.''