January Jones goes dotty as she flashes her bra in a flirty sheer polka print dress at fashion party

By Mail Online Reporter

Published: 02:42 EST, 30 July 2015 | Updated: 04:36 EST, 30 July 2015

January Jones went for a daring look in Los Angeles on Wednesday night. 

The 37-year-old actress - who found fame on Mad Men - flashed her bra in a sheer polka dot dress as she partied at a fashion store opening with some famous pals. 

January's flirty dress showed off her long legs and she vamped up the outfit even more with some red lipstick as she attended the Zimmerman Melrose Place flagship store launch hosted by Nicky and Simone Zimmermann. 

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Dressed to impress: January Jones showed flashed her bra in a sheer polka dot dress at the Zimmerman Melrose Place flagship store in Los Angeles on Wednesday 

Dressed to impress: January Jones showed flashed her bra in a sheer polka dot dress at the Zimmerman Melrose Place flagship store in Los Angeles on Wednesday 

Blonde beauty January was not the only famous face there and she caught up with Minka Kelly, who was radiant in a plunging top and full skirt.

Minka, 37, recently took to Twitter to deny reports that she was dating 54-year-old Oscar winner Sean Penn.

'Not my nature to address gossip but hoping this last one goes away already. Not dating a friend I had a group dinner with.' she wrote, alluding vaguely to the rumours about her and Sean.

Vamping it up: January vamped up her look with some bright red lipstick as she enjoyed a fun night out 

Vamping it up: January vamped up her look with some bright red lipstick as she enjoyed a fun night out 

The rumour will went into overdrive when Minka celebrated her birthday with a group of friends in California's Napa Valley on June 24.

Among the four guests was Sean, who reportedly told the others that he and Minka had first met at a charity event supporting Haiti.

Photos quickly circulated, fuelling rumours of a romance - single Sean had broken up with his long-time girlfriend, Charlize Theron, only weeks earlier.

Taking the plunge: Minka Kelly also opted for a daring outfit, choosing a plunging top for the fashion event 

Taking the plunge: Minka Kelly also opted for a daring outfit, choosing a plunging top for the fashion event 

Meanwhile, with Mad Men now finished, January was asked recently if she will ever return to the X Men franchise. 

She appeared as Emma Frost in First Class but did not reprise the role in Future Past, even thuogh it featured characters from different eras. 

Speaking to EW recently, January said: 'I don't have another one in the books, but I think Emma died … but she's a mutant.' 

She jokingly added: 'They'd have to give me a long heads-up though, because I don't really like to work out.'

Friends in high places: January caught up with store owners Nicky and Simone Zimmermann at the bash 

Friends in high places: January caught up with store owners Nicky and Simone Zimmermann at the bash 

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