The Secret to Happiness Is Love
Studio album by Vivian Hsu
Released	September 28, 2003
Recorded	TakeOne Studio
Genre	Mandopop
Length	47:37 (preorder edition 59:53)
Label	Avex Taiwan
Vivian Hsu chronology
Ai de Xuan Yin (2001) The Secret to Happiness Is Love (2003) Hen Hen Ai (2005)

The Secret to Happiness Is Love (我愛你 x4) is a studio album by Taiwanese artist Vivian Hsu. It was released September 28, 2003, by Avex Taiwan. The original title Wǒ Ài Nǐ means "I Love You". There were three versions of this album produced: a limited edition with artbook, a preorder edition with artbook and bonus single CD, and a regular edition without the artbook, but with a VCD containing music videos.

The album contains Hsu's first rap song, Mianju, which was later featured in the compilation album Ji Le 175. Also featured is Jueding Ai Ni (決定愛你; Juédìng Ài Nǐ), the theme song to the TV series Love Storm, in which Hsu starred in.

1. "王子變青蛙" (py. Wángzǐ Biàn Qīngwā) – 5:06
2. "四次我愛你" (py. Sì Cì Dōu Ài Nǐ) – 3:47
3. "Dream" – 4:37
4. "面具" (py. Miànjù, en. Mask) – 4:25
5. "決定愛你" (py. Juédìng Ài Nǐ, en. Decide to Love You) – 4:21
6. "我最好的朋友" (py. Wō Zuìhǎo de Péngyōu) – 4:44
7. "結婚對不對" (py. Jiéhān Duì Bùduì) – 4:37
8. "甜蜜的折磨" (py. Tiánmì de Zhémó) – 4:12
9. "どうして" (為什麼) (Doshite, py. Wèishénme, en. Why) – 4:14
10. "子彈" (py. Zǐdàn, en. Bullet) – 2:55
11. "Baby Baby" – 3:39

1. 決定愛你 <love mix> – 4:31
2. 決定愛你 <TV mix> – 4:24
3. 決定愛你 <karaoke> – 4:21