Kim Kardashian West went ''ballistic'' at Kanye West when she found him looking at pictures of his ex-girlfriend.

The 'Keeping Up With The Kardashians' beauty - who is expecting her second child with the 'Bound 2' rapper - was reportedly fuming with him when she found old pictures of Amber Rose on his computer.

A source said: ''Kim found Kanye looking at Amber's Instagram page and went ballistic. It's really damaged her confidence. He told her she was being ridiculous.

''She then went to his computer and found he still had old intimate pics and videos from their relationship. Kim was sobbing and confronted Kanye, telling him he had betrayed her, but her reassured her none of it was a big deal.''

And Kim - who is also the mother of two-year-old daughter North - is believed to be feeling even more insecure about her changing body shape as a result.

The source continued to Closer magazine: ''She feels insecure about her changing body and hates seeing Amber parading her amazing figure.

''She has told friends she sometimes feels like Amber is the third woman in their marriage and just wants something to be done to erase her out of their lives.''

A representative for Kim has denied this is true.