The 9 biggest celebrity weddings of all time: Will & Kate, Tom & Katie and more!

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As ET celebrates our 35th anniversary, we're looking back at the spectacular weddings that have taken place under our watch.

Here are the biggest celebrity weddings that ET has covered during our 35 seasons.

PICS: Celebs Who Had Secret Weddings

1. Princess Diana and Prince Charles: When ET premiered in 1981, everyone was obsessed with Princess Diana's wedding. Over 750 million people watched her say "I do" to Prince Charles during the two-hour ceremony at St. Paul's Cathedral in London, England.

2. Prince William and Kate Middleton: In 2011, 30 years after his mother's nuptials, Prince William's wedding became the most-watched of all time, as 2 billion viewers tuned in on TV and the Internet when the royal couple exchanged vows at Westminster Abbey in London, England.

For more from the ceremony, scroll through the gallery below:

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The 9 biggest celebrity weddings of all time: Will & Kate, Tom & Katie and more!

Kate Middleton waves back to an excited crowd as she enters the church. This was the first moment the world caught a glimpse at the stunning Sarah Burton for Alexander McQueen gown.

Photo: Getty Images

When Pippa Middleton stepped out behind her sister Kate, the world took notice of her 'perfectly shaped backside'. Blogs, Facebook Pages and Twitter accounts were set up in its honor!

Photo: Getty Images

Kate looked just lovely as her father walked her down the aisle.

Photo: Getty Images

The Duchess's dress had an impressive, yet manageable, train, which Pippa tended to like a pro.

Photo: Getty Images

The happy couple could breathe a sigh of relief as they left Westminster Abbey -- it was now time for celebration.

Photo: Getty Images

Kate is simply gleaming following the ceremony while she's being taken with her new husband to the palace.

Photo: Getty Images

Um, hands down the best dressed of the day. How adorable are these kiddos?!

Photo: WireImage/Getty Images

Queen Elizabeth II following the Royal Wedding is perfect in light yellow!

Photo: Getty Images

Prince Harry is no stranger to these types of high profile events, but he seemed to be really enjoying himself.

Photo: Getty Images

Kate's parents were impeccably dressed, with the Mother of the Bride simply glowing in pale blue.

Photo: AFP/Getty Images

Princess Beatrice of York and Princess Eugenie of York exit Westminster Abbey after the Royal Wedding showing off their intricate and detailed hats (which garnered plenty of attention).

Photo: Getty Images

Victoria Beckham arrives to attend the Royal Wedding wearing a navy dress with a matching small pill box hat.

Photo: Getty Images

Tara Palmer-Tomkinson arrives to attend the Royal Wedding wearing an intricate royal blue hat which matched her blue dress.

Photo: Getty Images

The first royal kiss occurred on the balcony of the palace, but the real moment occurred right below when the little flower girl pressed her hands against her ears -- clearly, she was not amused.

Photo: Getty Images

Kate's second dress -- for the evening festivities -- was just as stunning. We loved the sparkling belt!

Photo: AFP/Getty Images

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3. Arnold Schwarzenegger and Maria Shriver: The 1986 ceremony boasted an incredible guest list that featured John F. Kennedy Jr., his mom Jackie O. and even Oprah Winfrey. Maria filed for divorce from Arnold in July 2011, though their divorce has never been finalized. The two split after it was revealed he fathered a son more than 14 years earlier with an employee, Mildred Baena.

WATCH: Arnold Schwarzenegger Calls Divorce 'Biggest Failure,' Still Calls Maria Shriver 'My Wife'

4. Donald Trump and Marla Maples: The Donald's second time at the altar rivaled Schwarzenegger's nuptials in terms of famous guests. O.J. Simpson, Howard Stern and Rosie O'Donnell were among the famous guests who witnessed the business mogul enter into holy matrimony with his bride in 1993. The couple have a 22-year-old daughter, Tiffany, but split in 1999. Donald married again in 2005 to model Melania.

5. Marie Osmond and Steve Craig: The couple first wed in 1982, during a lavish ceremony that included roughly 7,000 guests. Marie and Steve re-married in 2011 after divorcing in 1985. For their second wedding, Marie wore the same gown from the 1982 ceremony.

6. Liza Minelli and David Gest: When this power couple wed in 2002, Michael Jackson was best man and Elizabeth Taylor was matron of honor. They called it quits in 2007.

7. Kevin Costner and Christine Baumgartner: Kevin swept his bride right off her feet in 2004, when they said "I do" on his Aspen ranch. After the ceremony, the couple rode up to our cameras on their ATV to show off Christine's blinding ring. They have three children together: Cayden, 8, Hayes, 6, and Grace, 5.

WATCH: Inside Celine Dion and Rene Angelil's Enduring 20-Year Love Story

8. Celine Dion and Rene Angelil: Despite their age difference -- Rene is 26 years Celine's senior -- the two fell in love and wed in December 1994. The singer made headlines with her heavy headdress made of Swarovski crystals.

9. Tom Cruise and Katie Holmes: The movie stars had the most adorable flower girl, their daughter Suri, for their 2006 wedding inside a converted 15th-century armory in Italy's Odescalchi Castle.

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