To the left, The Hills star Lauren Conrad poses for a MARK Cosmetics ad campaign in downtown Manhattan on Wednesday afternoon in NYC.

To the right, the newly single Kate Middleton at the Cheltenham Festival in England back in mid-March (she was still dating Prince William at the time but was not there with him).

Whose look is tops? LAUREN CONRAD or KATE MIDDLETON?

Kate Middleton, dressed in a trendy blue-patterned shift dress by Lipsy, returns to her London home on Thursday after a girls night out.

The ladies dined at La Bouchee restaurant and then hit the town clubbing at Mahiki nightclub, which is regularly frequented by ex-boyfriend Prince William

Her split with the Prince, following a five-year romance, was announced last weekend.

Prince William and girlfriend Kate Middleton have called it quits after nearly five years together.

The couple had reached an “amicable agreement” to separate, UK’s The Sun newspaper reported Saturday.

The split is said to have been caused by Prince William’s career in the army and pressures by the media (there was much speculation about wedding plans).

Prince William, 24, and Kate, 25, last appeared together on the horse tracks at Cheltenham Festival on March 13.

The weekend before that, the couple hit the slopes in Switzerland for a ski trip together.

So ladies, Prince William is single again!!!!!!

UPDATE: Pictures below include the last Kate Middleton sightings taken last week in Dublin, Ireland. Kate (sans Prince William) is pictured with her mother, Carole Elizabeth, on April 5 and with a gal pal on April 3.

Kate Middleton sans boyfriend Prince William (he had army duties in Dorset) shows her love for horse racing and made her second appearance with a mystery male at the Cheltenham Festival in England.

Kate, 25, wears her favorite stretch suede boots, cashmere pashmina and ‘The Alexander’ jacket trimmed with silk paisley (both by Katherine Hooker), a Philip Treacy beret, and Chanel sunglasses.

Kate and Wills together were spotted at the Cheltenham Festival on Tuesday.

Prince William, and girlfriend Kate Middleton suit up and arrive early Tuesday morning with Wills‘ cousin Zara Phillips for the first day of horse racing at the Cheltenham Festival in Cheltenham, England.

The royal couple was just spotted last week skiing together in the Swiss Alps.

Prince William and his royal bride-to-be Kate Middleton take to the slopes of Switzerland for a once-in-a-lifetime ski trip.

Upon leaving their Swiss Alps resort, Wills‘ gorgeous girlfriend Kate reportedly had a run-in with another skier. ICE one, Kate! The two knocked each other down, covering themselves in head-to-toe snow. Luckily, neither party was injured!

Wills, 24, and Kate, 25, are said to be staying in a $33,000-per-week chalet during their week-long break with friends in the exclusive Swiss resort of Zermatt.

Wills and Kate are pictured on the slopes together here and here.

For even more pictures of Prince William and Kate Middleton’s Ski Trip in Switzerland, CLICK HERE!

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Prince William cheers on the English rugby team sandwiched between his little brother Prince Harry and girlfriend Kate Middleton. The trio watched the RBS Six Nations Championship match between England and Italy at Twickenham on Saturday, Feb. 10 in London, England. England swept to a 20-7 victory against Italy.

Look how excited Wills looks and how uttlerly BORED Harry looks! Harry’s even listening to his iPod during the game (or whatever music player that is).

Prince William and his gal pal Kate Middleton celebrated a friend’s birthday party at Mahiki nightclub this past Thursday in Dover Street, London. Guests were required to wear a one piece outfit.

Prince William, 24, went as Superman while Kate, 25, dressed up in a pink dress.

A source for British tabloid The Sun said: “Prince William was absolutely hilarious. He bounded into the club with a blue muscle chest and red cape.

“He and Kate were on great form and were downing vodkas. They were quite touchy-feely and Wills had his hand on her bottom a few times during the evening — they looked like a young couple in love.

“Wills came in as Superman but left as Clark. And no one outside suspected a thing.”