Jack Black has advised Brad Pitt and Angelina Jolie their sex life will get better once they are married.

The Hollywood couple made their engagement public last week, and Jack - who has been married to Tanya Haden for six years, with whom he has two sons, Sammy, five, and Thomas, three - thinks things will get hotter between the sheets once they officially tie the knot.

He told US TV show 'Entertainment Tonight': ''I think the sex actually improves once you've sealed The Deal. It gets better.

''Maybe not for everyone, but for me, once we sealed the deal and we shut off all the exit holes and said, 'No, this is it. We're in it for life,' then we really let loose.''

Jack - who famously accidentally revealed Brad and Angelina were set to have twins in 2008 - also gave his honeymoon tips, saying they should try going to Big Sur national park in California where he and Tanya wed.

He added: ''I recommend to Brad and Angie, go to Big Sur for your honeymoon. Leave the kids with the nannies just for a couple days.''

Brad, 48, and Angelina, 36, are currently celebrating their engagement with the six children they raise - Maddox, 10, Pax, nine, Zahara, seven, Shiloh, five and three-year-old twins Knox and Vivienne - on a break to the Galápagos Islands, an archipelago located off the west coast of Ecuador. No date or location for their wedding has so far been made public.