London: She lost half of her outfit earlier on Monday when she went on a dinner date with her boyfriend Matt Rutler.
And it seems that bizarrely Christina Aguilera has forgotten her trousers again, as she stepped out bottomless for the second time this week.
The 30-year-old Dirrty singer wore just a pair of black underpants and stockings on her lower half as she went shopping at upscale department store Fred Segal in West Hollywood.
Her underwear was on full display for all to see as she exited the shop with a friend.
Seemingly unaffected by the cooler LA conditions, Christina paired her knickers with just a white T-shirt and leather jacket.
Since her split from husband Jordan Bratman, the mother of one, son Max, three, has exhibited increasingly bizarre behaviour.
She has gained weight, is often seen falling out of clubs with her young boyfriend Matt and her wardrobe has regressed to the bad old 'Xtina' days when she favoured leather chaps - with nothing underneath.
She accessorised the bizarre look with a pair of giant sunglasses, an oversized trucker cap and sky-high black Christian Louboutins.
Without a care in the world, The Voice judge waved to her fans as she jumped into an awaiting chaufffered car, which whisked her away down the road to racy lingerie shop Agent Provocateur.
And as if her risque attire wasn't enough, it looks like boyfriend Matt could be in for another treat if Christina's visit to the famed underwear store is anything to go by.
The blonde was spotted flashing a cheeky smile as she left the store, which is favoured by celebrities such as Victoria Beckham and Kate Moss.
While it was Christina's friend who was clutching the store's signature pale pink bag, the mischievious look on the Dirrty singer's face indicated that she perhaps had picked some sexy treats of her own.
Christina's daring shopping trip comes after she stepped out earlier this week looking smitten on the arm of Matt after the pair enjoyed a romantic meal.
With her wild blonde hair, fish nets and other skimpy attire, Christina was certainly going for the risque look for the dinner date.
The popstar opted for a T-shirt and leather jacket, but no trousers and bizarrely teamed the outfit with a pair of towering high heels, which would have better suited a nice evening dress.
The usually heavily-painted star also went make-up free as she and Matt enjoyed a Monday night out at Off Vine in Hollywood.
But the couple looked happy, with Christina beaming widely as she skillfully navigated the stairs of the restaurant in her heels while clinging on to her man's arm.
With her two happy outings this week, she has shown no sign of letting rival Kelly Osborne's comments about her weight get to her - or reports she has been told by executives on singing show, The Voice, to lose weight.
Christina, a judge on the U.S. show, is reportedly a size 12/14, or 9st, 4lbs, but has been told to lose 10lbs because it is 'difficult to dress her'.
A source told Closer magazine: 'TV bosses say it's a health issue. But what they really mean is she no longer looks sexy. She's been told to lose at least 10lbs before the next season starts in early 2012 - she went up two dress sizes in a matter of weeks.
'She's been recommended a nutritionist and is meant to be on a strict diet. But she enjoys a glass on wine, doesn't care what she eats and hates exercise.'.
Friends said she 'comfort ate' after her divorce from husband Jordan Bratman was finalised late last year.
Christina is said to have gained three stone after she gave birth to her son max in 2008, but had slimmed down to a size 10 again last year
The superstar was a tiny size six when she rose to fame as a teenager in 2000.
Meanwhile, Kelly Osborne discussed Christina's weight on E!'s Fashion Police Friday. Co-host George Kotsiopoulous defended her unflattering get-up at last weekend's Michael Jackson tribute concert.
He pointed out that she was 'still probably a [American] size 2/4' despite her poor outfit choice. 'Trust me,' Kelly, 26, sniped. 'I'm a 2/4. That is not a 2/4.'
She continued: 'She called me fat for years. I was never that fat.' Fashion police co-host Joan Rivers agrees with the analysis.
'Lady Marmalade got into the peanut butter again,' she said.
Christina has been the source of criticism for pairing a tight-fitting black bodysuit with fishnets, heavy-handed makeup and massive hair.
On a previous episode of the E! commentary show, Ozzy Osbourne's daughter had also attacked the Burlesque star's size.
'Maybe she's just becoming the fat b***h she was always born to be. I don't know. She was a c*** to me', she said.
'She called me fat for so many f***ing years," Osbourne vented, 'so you know what? F*** you! You're fat too.'
Kelly has battled her own weight issues in the past, but after appearing on Dancing with the Stars in 2009, managed to lose and keep off 48 pounds.
