What a difference! Make-up free Beyonce shows the strain of being a working mom... but is transformed in Super Bowl promo

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It looks like the stress of the past few weeks along with looking after baby Blue Ivy may be getting to Beyonce.
The 31-year-old star looked tired and wan as she arrived to rehearse for her Super Bowl performance in New Orleans earlier this week.
Wearing no make-up and a woolly hat, the singer looked a far cry from her usual glamorous self.
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Stressed out: Beyonce looked a far cry from her usual glamorous self in no make-up as she arrived to rehearse for her Super Bowl half time show in New Orleans earlier this weekThe singer was accompanied by her mother Tina Knowles, who looked more well-put together than her daughter in a bright turquoise top.
However, the star is transformed from dowdy to dazzling in a new Super Bowl promo photograph released on Tuesday.
Dressed as a football referee in a striped and black hot pants, Beyonce shows off her curvy figure in daring thigh high boots.
Thigh high boots: Beyonce showed off her curvy figure in a sexy referee outfit in the latest promo photo for the Super Bowl
But there was no sign of Beyonce's husband Jay-Z or their one-year-old daughter as the star prepared for her latest rehearsal.
Beyoncerecently opened up about how motherhood has changed her. She told GQ magazine: 'Giving birth made me realise the power of being a woman. I have so much more substance in my life.
'And expressing that excitement and that sensuality and the connection I have with my husband -- I'm a lot more comfortable with that now. I actually feel like my child introduced me to myself.'
Show of support: Beyonce was accompanied by her mother Tina Knowles who looked more glamorous than her daughter in a bright turquoise top
Moving on: Beyonce will be hoping to put the Inauguration lip syncing controversy behind her with a dazzling half time Super Bowl performance Working mother: Beyonce pictured with daughter Blue Ivy, now one-year-old
Meanwhile, the singer is gearing up to perform in front of millions around the world on Sunday at the Mercedes-Benz Superdome in New Orleans.
The singer will be hoping to put the recent lip syncing controversy of her Inauguration performance behind her by putting on a dazzling show.
She was accused of miming the National Anthem at President Obama's inauguration ceremony, when a spokesman for the Marine Corps Band said she opted for a pre-recorded track of the song instead of singing live.
But hourslater, a Marine spokesman backed off the claim and insisted he didn't know one way or the other: 'No one in the Marine Band is in a position to assess whether it was live or pre-recorded'.
Meanwhile, Beyonce is already stirring up a frenzy of anticipation for Sunday's show.
She added several new pictures of herself in rehearsal via her Instagram site on Tuesday, including shots of her lying on the ground laughing in the same hat.
Another photograph showed her sporting a striped jumpsuit smiling alongside a guitar player.
Star in stripes: Beyonce posted a photograph of herself in rehearsal on Tuesday, showing herself wearing a striped jumpsuit
Moment of relaxation: Beyonce was pictured lying on the floor laughing while her dancers were put through their paces
Concentration: Beyonce looked extremely focussed on the task in hand in one serious shotOne picture even showed the singer in front of her computer - perhaps personally posting photographs to her Instagram page.
A few days ago, she posted including a snap of her sporting a sweatshirt with the slogan: 'Can I Live,' with a seemingly pointed reference to the allegations.
Another picture shows her stretching and limbering up, wearing a T-shirt emblazoned with the nameof Jay-Z's basketball team, the Brooklyn Nets.
Taking the floor: Beyonce kept her woolly hat throughout her rehearsal on Tuesday
Mac geek: One shot showed the singer taking a break from rehearsals while sitting in front of her laptop
Star silhouette: One dramatic shot showed the singer posing in a pause from practice Meanwhile,amid swirling rumours, her Destiny's Child band-mate Michelle Williams recently denied that Beyonce would be reuniting with with the band for the show.
Michelle, 32, told WRUG Media: 'I'm going to be in the musical Fela! I hate to disappoint the people and tell them that it's not true.'
The singer is headlining a world tour of the Tony Award-winning show, which kicks off Tuesday in Washington, D.C.
All the gear: The singer posted a photograph of her band's musical instruments Whose legs? The singer could be behind this intricate pair of laced up studded trousers But according to the show's website, she will intriguingly not be appearing in the show that day.
'I'mso sorry. I'm so sorry,' Williams said of the reunion rumours. 'But we did record a song with each other before the holidays.'
Destiny'sChild - Love Songs, a greatest hits compilation of the group's most romantic recordings will feature a new song, Nuclear - their first in eight years.
However, Michelle did hint that a reunion outside the recording studio may still happen, saying: 'We have talked about it. You know, one day soon.' Something to say?: It looked like Beyonce might have been referencing her recent lip-synching scandal when she shared this photo on her Instagram page