It not often that you see celebrities ride public transport, let alone put on a public display of affection on it.

But Anne Hathaway and her fiance Adam Shulman were like a couple of giddy teenagers when they recently travelled on the subway.

All aboard the love train: Anne Hathaway and her fiance Adam Shulman kiss during a recent ride on the subway in New York

Perhaps Anne thought her new pixie crop would let her go unrecognised on the public transport system.

For her outing, Anne kept cool from the searing Manhattan heat in a sleeveless navy shirt which  showed off a snippet of her midriff, and a pair of denim Daisy Dukes.

Eyes for each other: The couple could not stop staring in each other’s eye

For the actress could not keep her hands off Shulman, with the couple’s arms draped around one another.

The actress shielded her face with some sunglasses and wore minimal make-up.

Anne is not usually known for her public displays of affection.

But with Shulman it seems a very different story.

Last week she was seen embracing her fiancé after a family dinner in French restaurant Picholine on Manhattan’s Upper West Side.

The actress was beaming as she leaned in to kiss her sweetheart on the cheek.

Cuddle bugs: The affectionate duo had their arms draped around one another

She giggled as she gave him a hug, touching her head against his.

The pair had enjoyed a meal with both their parents and a few close friends – a rare group event.

While there has been no word from the couple or their representation on the subject, it has been suggested that the evening was arranged to announce some special news.

Going strong: Anne and Adam have been together since 2008 and got engaged last November- but are yet to set a date for the wedding

A source told Radar Online: ‘Not only did both Anne and Adam have their parents at dinner with them, which is unusual, but the amount of enthusiasm and excitement made it clear that they were celebrating some major news.’

While everyone else sipped on wine at dinner, Anne didn’t drink any alcohol, which is an indication that she could be pregnant.’

While a baby on the way would certainly be the perfect way to cap off a stellar year for Anne, clearly nothing is certain unless confirmed by her.

White hot: Last night Anne appeared to be channelling the sexy nature of her on-screen alter-ego Catwoman as she arrived for the premiere of The Dark Knight Rises in Los Angeles

Anne and Adam have been together since 2008 and got engaged last November- but are yet to set a date for the wedding.

Meanwhile Anne has been busy promoting her new movie, The Dark Knight Rises.

And last night she appeared to be channelling the sexy nature of her on-screen alter-ego Catwoman as she arrived for the premiere of the film in Los Angeles wearing a very daring white outfit.

Miaow: The Dark Knight Rises is the third and final installment of the Batman saga and hits cinemas July 20

Anne opted for a sultry white dress, which featured both a plunging neckline and a draped back – leading to a stunning overall effect.

She teamed her Grecian-style dress with a pair of silver pointed court shoes, and drew attention to her cute elfin haircut by keeping her jewellery simple with stud earrings.

The Dark Knight Rises is the third and final installment of the Batman saga and hits cinemas July 20.