You know him as the sexy diagnostics Dr. Robert Chase on House M.D. and he's now starring in NBC's upcoming firefighter drama Chicago Fire.
1. Born Jesse Gordon Spencer on February 12, 1979 in Melbourne, Australia. His parents -- Robyn and Rodney -- are politically active in Australia and have run several times as candidates in federal and state elections.
2. Plays violin in the group Band From TV, which was formed by Heroes star Greg Grunberg, and includes his House co-star Hugh Laurie and Desperate Housewives actor James Denton.
3. Sang the song Molly Smiles on the 2003 Brittany Murphy/Dakota Fanning film Uptown Girls.
4. Was roommates in London with X-Men: First Class star James McAvoy, who invited Spencer to the Los Angeles premiere of his film The Last King of Scotland.
5. Got engaged to his House M.D. co-star Jennifer Morrison in 2006, but they broke off the engagement about a year later.