Guess which album Mariah Carey calls her 'most bittersweet album'?

Mariah Carey has more than ten albums under her name. 

She broke into the music scene in 1990 when she released her self-titled album.

The album 'Mariah Carey' was such a  huge success that it had four #1 hits - 'Vision of Love', 'Love Takes Time', 'Some Day', and 'I Don't Wanna Cry'. 

She went on to release more #1 hits and she continues to have a successful music career, having recently headlined the Global Citizen Festival in New York City. 

Watch: The biggest Global Citizen performances

On October 3, Mariah celebrated the 27th anniversary of her album 'Daydream'. 

She described it as a 'bittersweet' album. 

She didn't elaborate on her reasoning for describing the album in this way, but she claimed that readers of her memoir, 'The Meaning of Mariah Carey', would understand. 

"Happy anniversary Daydream. My most bittersweet album (if you read the book, you’ll know why!)," she wrote on Twitter. 

She went on to celebrate the millions of copies the album has sold. 

"Oh and I believe it’s 11x platinum by the way (but we like the sound of Diamond!)," she wrote on Twitter. 

'Daydream' became Mariah's second RIAA Diamond-certified album after 'Music Box'. 

Popular singles from the album include - 'Fantasy', 'One Sweet Day', 'Always Be My Baby', 'Open Arms', 'Forever' and 'Underneath the Stars'. 

 The album's first single, 'Fantasy' topped the charts and 'One Sweet Day' was named the longest-running No. 1 single on the Billboard Hot 100 for over two decades. 

See the Tweets from Mariah Carey as she celebrated the anniversary of her album.

READ: Mariah Carey celebrates 'Butterfly' album's  25th anniversary

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