Jessica Alba, 30, might be due, any minute now, but that hasn't stopped her promoting her latest flick, 'Spy Kids: All The Time In The World 4D' and part-taking in a few laughs with Jimmy Kimmel and a birthing class.

JESS REVEALS HER POST-BABY WORK OUT

She tweeted, "Chk out @jimmykimmel 2nite -@cash_warren couldn't make a "birthing class" so Jimmy accompanied me instead & we got it all on tape (sic)"

In the hilarious sketch on Jimmy Kimmel Live!, Jimmy, 43, starts goofing around as soon as he gets there, asking the birthing educator taking the class: "How are babies made?"

As Jessica takes on the role of the father and helps him push, Jimmy moans: "Why did you do this to me?"

To which she replies: "You asked for it!"

CELEB BIRTHDAY STORIES

After lots of pushing, Kimmel eventually gives birth to the fake baby, and says: "I want to name it Pippa Middleton."

After promoting the latest 'Spy Kids' she'll be giving birth in a matter of weeks. She's understood to be expecting another girl and is planning a 'hypnobirth', and explained to TV chat show host and comedian Ellen Degeneres what it entailed.

She said: "Basically my husband takes me through sort of a meditation. So he's like saying, "You're relaxed and you're floating on clouds', while you're going through labour and your contractions."