How many albums do Backstreet Boys have?

As of my limited knowledge up to January 2022, the Backstreet Boys have released nine studio albums:

1. Backstreet Boys (1996)

2. Backstreet's Back (1997)

3. Millennium (1999)

4. Black & Blue (2000)

5. Never Gone (2005)

6. Unbreakable (2007)

7. This Is Us (2009)

8. In a World Like This (2013)

9. DNA (2019)

Please note that there might be additional releases after this date. To stay up-to-date on their latest albums, I recommend checking official sources such as their official website or social media pages.