Barbra Streisand deems four "the most creative number in the universe", after a rabbi gave her insight into its qualities.

The veteran singer adopted four as her lucky number once she learned of its "very complex" abilities.

She says, "It's a good number. It's the most creative number in the universe. With the number four you can create five. You can create any number in the universe with the number four - and only with the number four.

"It's very complex. A mathematician rabbi once explained this to me. You have to trust me on this!"