The reality TV star and singer, who has previously been romantically linked to One Direction's Harry Styles and her MIC co-stars Jamie Laing and Spencer Matthews, is said to have formed a relationship with Kelly Brook's ex after being introduced to him at the Birmingham-based fashion event, Clothes Show Live.
"They met through mutual friends at an event," a source told The Mirror. "They seem pretty smitten and loved up with one another.
"They were all over each other [at the Clothes Show Live]," the source added. "Thom and Caggie stayed in the same hotel, they've been dating for a few weeks."
Caggie, 24, and 28-year-old Thom's rumoured relationship comes shortly after the former rugby player ended his whirlwind romance with 90210 star Jessica Lowndes.
Having split from Kelly in February, Thom confirmed that Jessica was his girlfriend in a series of Instagram photographs from music festival Coachella in April.
The pair called in quits in October after seven months together.