With only nine months to go until the 2012 Olympics in London, the jockeying for position among megayacht owners is well underway.

Berths for about 30 yachts are being prepared around London’s waterways for the big event, but most of them will only accommodate smaller vessels.

Several more are expected to visit though they won’t all be in town at the same time.

The new Horizon RP110 superyacht Lady Gaga, which is the first motor yacht above 100 feet built for the Chinese market, was launched by Horizon Yachts.

The Lady Gaga motor yacht by Horizon has just successfully completed her sea trial, with delivery to her owner in China set for later this month.

Horizon created a unique exterior design for yacht Lady Gaga, one that is a radical departure from previous launches of RP series and includes both a vertical window line and wide body to allow for increased interior space.

The 55 metre superyacht Quinta Essentia, the largest vessel ever launched by the Netherlands’ Heesen Yachts, has been listed for sale for $100 million.

With sleek exterior lines by Frank Laupman of Omega Architects, the yacht’s most striking feature is a grand swimming pool on the aft deck complete with a waterfall.

The yacht has a very modern interior by Ken Freivokh Design and Michela Reverberi with metallic silver accents.

Kirsty Bertarelli, the richest woman in Britain and her husband Ernesto have bought the biggest motor yacht ever built in the UK, the 315-ft. foot Vava II.

The $160 million megayacht, which now ranks as the 33rd largest in the world, was built by Devonport Yachts in Plymouth and boasts luxury interiors, a helicopter landing pad, lavish guest cabins and four tenders.

Kirsty is a former Miss UK, while her husband is a Swiss pharmaceuticals magnate who has won the America’s Cup twice with his yacht Alinghi and is worth a reputed $10 billion, making him the 81st richest man in the world and the fifth richest in the UK.

Rihanna let her hair down recently in the French Riviera aboard on Benetti’s stylish 172-ft. superyacht Latitude, which charters out at about $300,000 a week.

The London Daily Mail reports that the 23-year-old star rented the vessel for some R&R following her performances at the UK’s V Festival.

She thrilled paparazzi with glimpses of a toned bikini bod as she paraded around the yacht’s five decks.

A Saudi sheikh left Roman Abramovich stranded at sea this week after taking the last megayacht berth at the so-called “Millionaire’s Quay” in Cap d’Antibes.

The Russian oligarch had wanted to moor his massive $800 million, 533-ft. yacht Eclipse, at the famed dock but arrived to find the only available spot had just been snatched by Saudi Arabian royal Prince Aziz al Saud.

According to Dailymail, the last space in Europe’s biggest yachting harbour simply wasn’t big enough for the two superyachts.