Alexander Xian Cruz Lim-Uy (Tagalog: [ˈsijɐn lim]; born July 12, 1989) is a Filipino actor. He is currently an exclusive actor of GMA Network and GMA Pictures. He is best known for his roles in My Binondo Girl (2011), The Reunion (2012), Ina, Kapatid, Anak (2012–13), Bakit Hindi Ka Crush ng Crush Mo? (2013), Bride for Rent (2014), The Story of Us (2016) and Everything About Her (2016). Lim was a contract artist of Star Magic from 2008 to 2017, until signing a contract with Viva Artists Agency in January 2018, and he officially moved to GMA Network in 2022. Since 2012, Lim has notably hosted for many major televised events, particularly Binibining Pilipinas (Miss Philippines) annually, as well as Miss Grand International in Vietnam in 2017.

Born in San Francisco, California, Lim and his family moved back to Manila, Philippines six months after his birth. Following his parents' separation, he (age 10) and his mother relocated to Daly City, California. Raised by his mother, a former model turned piano teacher, resulted in Lim learning various musical instruments including piano, trombone, saxophone and guitar. He later joined a symphonic band before graduating high school at age 18. He briefly studied psychology at Skyline College in San Bruno, California, until moving to the Philippines to attend college as a basketball varsity scholar at the University of the East in Manila. However, he never played in the UAAP as he had to undergo two years of residency.

Before attaining a degree, he became involved with modeling, and eventually, acting.

Lim was cast in a few minor roles before landing a supporting role in Katorse in 2009.

In 2010, he was part of the cast in the drama Rubi as Luis Navarro. Then, he guest starred in 100 Days to Heaven as Jojo Villanueva. He was a guest judge on Showtime and had one-episode appearances for Midnight DJ, Maalaala Mo Kaya, Wansapanataym and Your Song Presents: Andi. In 2011, after a special participation in Minsan Lang Kita Iibigin portraying the young Joaquin del Tierro, he landed his first major lead role in My Binondo Girl top-billed by Kim Chiu. The romantic-comedy television drama was a nationwide success, garnering an average household TV rating of 28.2% provided by Kantar Media/TNS.

In early 2012, Lim signed a three-picture contract with Star Cinema and appeared in the film, My Cactus Heart. In the same year, he starred in a youth-oriented movie with Enchong Dee, Enrique Gil and Kean Cipriano, entitled The Reunion. He was also back in primetime through the teleserye drama Ina, Kapatid, Anak with Kim Chiu, Maja Salvador and Enchong Dee. He also released his debut studio album So It's You under Star Records which reached a Gold Record status.

In 2013, his film Bakit Hindi Ka Crush Ng Crush Mo? with his onscreen and offscreen partner Kim Chiu earned Php 10.5 million in the first day of film showing alone, consequentially surpassing the P100 million mark at the box office for the year 2013 in three weeks time. From the outstanding box office sales, the pair obtained the nickname as the newest blockbuster royalties of their generation.^{[citation needed]}

In 2014, his second movie with Kim Chiu entitled Bride for Rent earned a whopping Php 21.2M on its first day and Php 100M in just 4 days. The movie eventually grossed Php 326,958,423 during its whole run in theaters which validated the KimXi tandem's box office draw.^{[citation needed]}