She declared Friday ‘the best bday ever!’

And Lady Gaga – wearing a bright red leotard – opted to celebrate turning 28 by kicking off her seven-night residency at the Roseland Ballroom in New York.

‘Time to give Roseland the goodbye it deserves, with all the roses in NY!’ she tweeted to her 41.1 million followers. ‘ITS SHOWTIME BABY!’

‘ITS SHOWTIME BABY!’ Lady Gaga – wearing a bright red leotard – opted to celebrate turning 28 by kicking off her seven-night residency at the Roseland Ballroom in New York Friday

The outlandish pop diva brandished a rose-adorned keytar onstage the 52nd Street theatre, which will soon close its doors after 56 years.

The five-time Grammy winner is the final performer to take the stage at Roseland before its transformed into a 59-storey residential tower.

‘It’s basically the only room in the city I haven’t played,’ Gaga told The New Yorker, noting that Manhattan clubs are ‘where I learned to be bold.’

Everything’s coming up roses! The outlandish pop diva brandished a rose-adorned keytar onstage the 52nd Street theatre, which will soon close its doors after 56 years

Eye-catching: The G.U.Y. singer – born Stefani Germanotta – kept her trusty fishnets on throughout, but changed into several colourful bra-tops, sparkly panties, and high-heeled boots

‘Time to give Roseland the goodbye it deserves!’ The five-time Grammy winner is the final performer to take the stage at Roseland before its transformed into a 59-storey residential tower

Hitting the road: Gaga’s seven-night Roseland residency ends April 7, and she’ll kick off her ARTPOP Ball Tour May 4 at Florida’s BB&T Center in Ft. Lauderdale

The G.U.Y. singer – born Stefani Germanotta – kept her trusty fishnets on throughout, but changed into several colourful bra-tops, sparkly panties, and high-heeled boots.

The Do What U Want singer also shared a backstage vanity-mirror selfie while getting made-up for the concert.

Outside the legendary venue, Gaga’s Little Monsters patiently waited in long lines wearing festive happy birthday tiaras and wigs.

‘It’s basically the only room in the city I haven’t played’: The Do What U Want singer also shared a backstage vanity-mirror selfie while getting made-up for the concert

Devoted fan base: The marquee to the legendary New York venue indicated that Gaga’s birthday concert was sold out

Cute: Outside, Gaga’s Little Monsters patiently waited in long lines wearing festive happy birthday tiaras and wigs

Look who’s a fan! Of Mice and Men star James Franco was spotted leaving Gaga’s birthday show

Like the top of a Christmas tree! The Born This Way hitmaker left her inaugural concert bearing angel wings and a tinsel-like leotard, looking similar to her Just Dance days

Pleased as punch: Gaga looked pretty confident about this particular look as she posed for her many admirers

After being ferried to Roseland in a rose-covered yellow cab, the Applause hitmaker emerged in her ‘birthday suit.’

Her 14 tattoos and nude thong were on full display under the ultra-sheer bodysuit, which preserved her modesty with artfully-placed roses.

Earlier Friday, Gaga played with proportions in a golden egg-shaped mini-dress and a bizarre wavy headpiece.

Put your paws up! After being ferried to Roseland in a rose-covered yellow cab, the Applause hitmaker emerged in her ‘birthday suit’

Lady in red: Her 14 tattoos and nude thong were on full display under the ultra-sheer bodysuit, which preserved her modesty with artfully-placed roses

Drowning in fabric: Earlier Friday, Gaga played with proportions in a golden egg-shaped mini-dress and a bizarre wavy headpiece

Also at rehearsal, Mother Monster donned yet another ultra-sheer black bodysuit and massive white platform trainers.

The birthday starlet’s fourth and final streetwear for her special day was a curious white visor, massive shades, and a sporty blue dress.

Gaga’s seven-night Roseland residency ends April 7, and she’ll kick off her ARTPOP Ball Tour May 4 at Florida’s BB&T Center in Ft. Lauderdale.

Costume #3: Also at rehearsal, Mother Monster donned yet another ultra-sheer black bodysuit and massive white platform trainers

The birthday starlet’s fourth and final streetwear for her special day was a curious white visor, massive shades, and a sporty blue dress