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Jaimie Lauren Alexander (née Tarbush; born March 12, 1984) is an American actress. She is known for portraying Jessi on the TV series Kyle XY and Lady Sif in the Marvel Cinematic Universe films Thor (2011), Thor: The Dark World (2013), and Thor: Love and Thunder (2022), as well as the television series Agents of S.H.I.E.L.D. (2013–2020) and the Disney+ series What If?... (2021). From 2015 until 2020, she starred in the NBC series Blindspot.
| Year | Title | Role | Notes |
| 2004 | Squirrel Trap | Sara | |
| 2006 | Rest Stop | Nicole Carrow | |
| The Other Side | Hanna Thompson | ||
| 2007 | Hallowed Ground | Liz Chambers | |
| 2010 | Love and Other Drugs | Carol | |
| 2011 | Thor | Sif | |
| 2012 | Loosies | Lucy | |
| 2013 | The Last Stand | Sarah Torrance | |
| Collision | Taylor Dolan | ||
| Savannah | Lucy Stubbs | ||
| Thor: The Dark World | Sif | ||
| 2016 | Broken Vows | Tara | |
| 2018 | London Fields | Hope | Filmed in 2013 |
| 2022 | Last Seen Alive | Lisa Spann | |
| Thor: Love and Thunder | Sif | Cameo | |
| The Minute You Wake Up Dead | Delaine Moore |
| Year | Title | Role | Notes |
| 2005; 2025 | It's Always Sunny in Philadelphia | Tammy | 2 episodes |
| 2006 | Standoff | Barista | Episode: "Pilot" |
| 2006–2007 | Watch Over Me | Caitlin Porter | Main role |
| 2007–2009 | Kyle XY | Jessi XX | Main role (seasons 2–3) |
| 2009 | Bones | Molly Briggs | Episode: "The Beaver in the Otter" |
| CSI: Miami | Jenna York | Episode: "Flight Risk" | |
| 2011 | Nurse Jackie | Tunie Peyton | 3 episodes |
| Covert Affairs | Reva Kline | 2 episodes | |
| The Birds of Anger | Annie | Short | |
| 2012 | Perception | Nikki Atkins | Episode: "Messenger" |
| 2014 | Under the Gunn | Herself / judge | Episode: "Superhero Fashion" |
| 2014–2015 | Agents of S.H.I.E.L.D. | Lady Sif | 2 episodes |
| 2015–2020 | Blindspot | Jane Doe / Remi Briggs / Alice Kruger | Main role |
| 2015 | The Brink | Gail Sweet | Recurring role |
| 2017 | Talking with Chris Hardwick | Herself | |
| 2021 | What If...? | Lady Sif | Voice; 2 episodes: "What If... the World Lost Its Mightiest Heroes?", "What If... Thor Were an Only Child?" |
| Year | Title | Voice role |
| 2011 | Thor: God of Thunder | Lady Sif |
| Year | Award | Category | Nominated work | Result |
| 2008 | Saturn Awards | Best Supporting Actress on Television | Kyle XY | Nominated |
| 2011 | Scream Awards | Best Supporting Actress | Thor | Nominated |
| Breakout Performance – Female | Thor | Nominated | ||
| 2017 | 10th Action Icon Awards | Action Iconic Award | Blindspot | Won |