Rita Ora broke down as she appeared in court to relive the moment she came face to face with an intruder in her Kensal Rise home.

The X Factor judge, who was in the house along with her sister, Elena, shouted at the burglar when he was seen picking up a jewellery box.

In a 999 call that was played to the court, Ora was heard threatening to "f*** up" the thieves.

After locking herself in a bedroom with her sister, she was also heard saying: ""Don't you f****** come up these stairs. I will f*** you up - you f****** hear me?"

She sobbed: "Oh my God, I don't have a knife, I know they're going to come upstairs.

"What do I do? What do I do? Oh my God. F****** hell - I'm scared to go downstairs."

Ora, who also gave evidence from behind a curtain, broke down in tears after the recording was played and asked for a moment to compose herself.

She said she watched a film with a girlfriend before they went to bed at around 2.30am.

"I went to sleep and was woken up by a scream," she added.

"I was half asleep, then woke up and heard my sister running up the stairs.

"I opened the door ... she just ran up the stairs then she jumped on my bed and started screaming."

She then called the police and the jury at Harrow Crown Court were played the 999 call made by the the pop star.

Speaking to the operator, she said: "I need you to come now, there is a robber in my house.

Rita Ora performs

"I've just locked myself in my room, my sister saw him in her room. Please send them round now."

She is then heard saying: "I don't have a knife. I'm locked in my room. They're going to come up the stairs."

Asked where her sister was by the operator, Rita said: "She is here in my room. I've got one lock on my room."

She is then heard gasping in shock while her sister tells her what happened in her room the floor below.

Speaking to her sister, Rita said: "We need to get ready just in case some s*** happens."

She was then heard shouting to from inside her bedroom: "Don't f***ing come up these stairs. I will f*** you up, you f***ing hear me."

Then speaking to her sister she said: "Stand next to me and we can f*** him up as he walks up the stairs."

The police arrived at her home while she was on the call and the pair then went to find them.

The former X Factor judge was heard crying in court after the tape had finished.

Meanwhile, Rita's sister has told a jury she was "overwhelmed with fear" when she woke to find a thief ransacking her bedroom in a £200,000 raid on the singer's home.

The former X Factor judge, 25, and her sister, Elena, were both asleep upstairs when two men broke into the three-storey house in a targeted attack.

Charaf Elmoudden, 26, and an accomplice allegedly made off with jewellery, iPhones, Apple Mac computers, bags and clothes from the singer's four-bedroom property in north-west London .

Elena woke up at around 5.50am to find a man rifling through her bedroom, Harrow Crown Court was told.

Giving evidence from behind a screen, she described the moment the intruder "looked dead in my eye" after she confronted him.

"At one point he was an arm's length away which was really scary because it means he was looking at me directly while I was asleep," she added.

"I said hello and was really confused and he turned around and looked at me. He looked dead in my eyes.

"Then I realised I didn't know him, didn't recognise him, and that he was a thief.

"I went to scream 'Oh my God' but couldn't really scream because I became overwhelmed with fear."

The thief grabbed a jewellery box and "whatever else he could" before dashing out of the house, Elena said.

Ora had returned to the semi-detached house she shares with her family at around midnight on November 27 last year and was asleep in her bedroom on the top floor during the raid, the court was told.

Prosecutor Mark Kinsey said her house was deliberately chosen by the thieves because they knew she lived there.

He added: "That address was targeted because that address... was known to contain a large amount of valuable items.

"The property belonged to the recording artist and actress Rita Ora - her and her sister and another lady were present at the time."

He added: "They knew whose address that was and it was targeted."

Elmoudden, of Sydney Road, Muswell Hill, north London, appeared in the dock in custody wearing jeans and a white shirt.

He denies the charge of burglary on November 28 last year.

The trial continues.