More than 10 million guests who’ve stayed at MGM Resorts, including celebrities and high-profile CEOs, have had their personal information hacked in a data breach.

According to USA Today, MGM officials recently confirmed a data breach that exposed the information of about 10.6 million guests. MGM operates numerous properties in Las Vegas with celebrities such as Justin Bieber and Twitter CEO Jack Dorsey reported as some of the guests affected by the data breach. The breach revealed guests’ names, addresses, birth dates, email addresses and phone numbers. Company officials said no financial data was exposed.

The data breach took place last summer but the personal information stolen wasn’t released online until this month. MGM officials said an unauthorized user accessed a cloud server that contained guests’ personal information.

The MGM data breach comes about two years after Marriott International experienced a data breach that exposed the personal information of up to 500 million guests.