After graduating from high school, Dizon decided to pose for the cover features of various import-car magazines. This gained her much attention and a fanbase overseas, predominantly in East Asia. One year after her pictures were posted up on the internet, she already had 2,000,000 hits from search engines. Following the advice of her fans, Dizon sent a demo tape with model photographs of herself to a talent agency in Japan and in April of 2006, after being accepted, she immediately moved to Tokyo. In October 2006, she released her first photobook titled Petite Amie (Girlfriend in French), which was ranked as the third best-selling photobook of that year.
On February 14, 2007, she released her first physical single, Softly under the Victor Entertainment label. It peaked at number #7 in the Oricon Weekly Chart. On the same day, she also released her second photobook titled Hello! Leah.
On May 30, 2007, Dizon released her second single Koi Shiyō (恋しよう♪, Koi Shiyō?), which also peaked at #7 on the Oricon Weekly Chart. The title track is described as a 'grooving, up-tempo dance song' and the single features 2 B-sides: Could you be that one? and Aishiteru～ Love Story (アイシテル～ Love Story, Aishiteru～ Love Story?). The title track, Koi Shiyō is being used in a Lotte TV ad while Could you be that one? is being used in a PlayStation 3 Ninja Gaiden Sigma TV ad, with Dizon starring in both commercials.
Her third single entitled L・O・V・E U was released on August 8, 2007.
Leah released her debut album "Destiny Line" on September 12, 2007. The CD+DVD Edition contains 14 tracks, 10 of which were penned by Leah herself the single PVs as well as a special album PV "Again and Again". The CD Only Edition contains the digitally-released remix of Koi Shiyō, called Koi Shiyō♪ (yasutaka nakata-capsule mix).
Leah Dizon's third photobook titled Heaven, was released October 5, 2007. It includes a DVD.
Dizon released her fourth single entitled "Love Paradox" on March 26, 2008. The Title track is an American like Urban song, and the B-side "Under the same sky" is a mid-tempo ballad. The same day, she also released her fourth photobook, "Pure Leah."
On April 18 it was announced that Leah's song, Under the Same Sky, will be used as the theme song for the Japanese drama, Tokyo Prom Queen. Leah will also make a guest appearance on the show as Naomi, the prom queen from the previous year.
Her fifth single, Vanilla was released on June 25, 2008. Her second album, Communication!!!, was released August 20, 2008.
During October Leah announced she was already 4 months pregnant and married. Since the announcement she has put her career on hold until the baby arrives next spring. She gave birth to a baby girl named Mila April 24, 2009. She hopes to return to her career soon!