CTKD is first duet album by Dato' Siti Nurhaliza and Krisdayanti. CTKD is the abbreviation of Canda (Joke), Tangis (Cry), Ketawa (Laugh), Duka (Sad), since they are both known as CT (Siti) and KD (Krisdayanti). The album was released on December 28, 2009.

With six songs, the album was created by famous Malaysian and Indonesian composers and writers like Aubrey Suwito, Audi Mok, Sharon Paul and others to suit both their vocal range and harmony. For the first time in this album, Dato’ Siti Nurhaliza uses vocalist from ST12, Chaly. It also includes 4 bonus instrumental songs of their songs on the album


Tracklisting:
1. Jika Kau Tak Datang
2. Sebagai Teman
3. Tanpamu
4. Amarah
5. Hanya Dia
6. Dalam Diamku
7. Tanpamu (minus one)
8. Amarah (minus one)
9. Hanya Dia (minus one)
10. Dalam Diamku (minus one)