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.
Forgotten something... again? Christina Aguilera stepped out bottomless for the second time this week today, for a shopping trip in West Hollywood
Not a care in the world: Christina's underwear was on full display for all to see as she exited the store with a friendHer 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.
Not a good look: The 30-year-old Dirrty singer wore just a pair of black underpants and stockings to shop at upscale department store Fred Segal in West Hollywood
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.
Nonchalant: Without a care in the world, The Voice judge waved to her fans as she jumped into an awaiting chauffeured car, which whisked her away
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.
Cold? Moi? Seemingly unaffected by the cooler LA conditions Christina paired her knickers with some black stockings, a white t-shirt and a leather coat
Something for boyfriend Matt? Christina later visited racy lingerie shop Agent Provocateur in the same outfit
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
Bottoms off! Christina lost her trousers earlier this week as she and boyfriend Matt Rutler enjoyed a romantic meal at Off Vine in Hollywood on Monday
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'.
Bulked up: Christina looked heavier as she performed at the 'Michael Forever' memorial concert for the late Michael Jackson in Cardiff last weekend
'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.'.
Criticism: Kelly Osbourne has weighed in on Christina's figure
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.