Elizabeth JaggerElizabeth JaggerWe at Showbiz HQ love a good fancy dress party.

And so does Elizabeth Jagger judging by her lovely Viking helmet.

She took the opportunity to go for the full-on Viking wench effect, complete with sumptuous gown.

It was all in honour of her brother James' birthday party.

And of course, their dad Mick was there to celebrate.

Not all the guests took up the gauntlet and donned outlandish costumes, though.

Who would give up the chance to dress up as anything they liked, from a squirrel to a lawnmower?

We can't understand it ourselves...

But we were mighty impressed by some of the crazy get-ups.

Take a look in our gallery, above.