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The Big Brother Germany – or Promi Big Brother – star seemed to forget she was locked in a house filled with cameras, as she engaged in a solo sex act, featuring a shower head.

Now Katja is back in the bath again, making her privates the star of the show.

The YouTube star filled up the tub with bubbles and took to the water.

Katja slipped into the suds in a metallic two-piece that left very little to the imagination.

The 22-year-old resumed her risqué behaviour as she submerged herself in the water and pulled out a pink razor.

In full view of the cameras, Katja began to preen her intimates.

Strangely, Katja looked up halfway through her bathtime routine and caught the eye of the camera, but instead of moving away, she manoeuvred herself right towards it.

It would appear the Sex Tape singer is loving the attention her controversial antics bring.

(Image: TNI PRESS) (Image: TNI PRESS)

Katja shocked viewers with her saucy display in the communal bathroom.

Two of her fellow Big Brother housemates even burst in – and it didn't stop her.

Our version of Big Brother is practically PG in comparison, but there has been some very controversial moments so far.

Rodrigo Alves caused widespread anger when her dropped the N-word twice on launch night.

(Image: TNI PRESS) (Image: WENN)

And there was Jermaine Pennant and Chloe Ayling, who teased a possible romance – even though he's married.

Meanwhile, Roxanne Pallett accused Ryan Thomas of punching her in the ribs.

Celebrity Big Brother continues tonight at 9pm on Channel 5.