By Daily Mail Reporter
Downcast: Kim Kardashian looked glum when she touched down in Los Angeles this afternoon, as Bret Lockett affair claims continue to rumble
She is currently contending with claims by NFL star Bret Lockett that the two recently had an affair.
So it was no surprise that Kim Kardashian looked glum as she touched down in Los Angeles this afternoon, after her recent trip to London.
The usually camera friendly 30-year-old kept her head down as she faced the media storm waiting for her at LAX airport.
In an act of defiance, Kim continued to wear her $2 million engagement ring given to her by fiancé Kris Humphries.
Dressed in a pair of black trousers with thigh-high boots over the top, a printed t-shirt and a tuxedo jacket, Kim cut a sullen figure as she made her way through the terminal.
The reality star swept her hair up in a tight bun, unusual for the star who prefers it coiffed and flowing.
Shielding her eyes with giant sunglasses and keeping her head down low, Kim was clearly not in the mood.
Kim has demanded an apology from Lockett, after he claimed the pair had a five-month affair.
A lawyer acting on behalf of reality star Kim's behalf sent a stern legal letter warning the NFL player of a potential lawsuit if he continued to make the claims.
But the sportsman has refused to back down, claiming he has 'concrete proof' of the 'long-distance' relationship, which he says was conducted entirely via telephone.
His alleged evidence includes 'intimate' photos sent by text message, flirty text messages and phone records showing conversations between the two.
Not herself: Shielding her eyes with giant sunglasses and keeping her head down, Kim was clearly not in the mood
Kim recently celebrated her engagement to basketball star Kris Humphries, who she has been dating for six months. The two are said to be planning a summer wedding.
Despite Lockett's claims he refused to give details on when his 'affair' with Kim took place.
But in a video interview on TMZ he even hinted that he would submit the evidence to court if sued by Kim.
Denial: Kim in London yesterday, has reacted angrily to claims she had an affair with NFL player Lockett, pictured right
'At the end of the day, Kim knows what happened and I know what happened,' he said.
'Kim can deny this all she wants, but if she wants to go the legal route and start recalling text messages and conversations and pictures and all of that, then that's not a problem.'
InTouch, which reported the claims under the headline: 'Kim caught cheating', backs its claims with a series of relatively harmless undated texts it claims a friend saw on Lockett's phone.
New love: Kim is happily engaged to sports star Kris Humphries
In one it alleges she told him 'You should SEND me a sexy picture.'
Kim is alleged to have asked a friend to get Lockett's number for her from his brother.
Lockett told the magazine: 'She pursued me.'
Kim, currently in London promoting her various business lines, made what appeared to be a veiled reference to the reports on her Twitter page.
She wrote: 'Remember, people only rain on your parade because they're jealous of your sun & tired of their shade.'
Business woman: Kim didn't let the drama affect her work as she launched her new perfume at Debenhams on Oxford Street in London earlier today