The star of the 2014 series has come out in support of the 17-year-old singer ahead of the X Factor 2015 final at Wembley this weekend.
"I think Louisa's going to take it. She's been backed the whole way through and she's got an unbelievable voice," Jake told us at The Clothes Show Live on Saturday (5 December).
He's also 'fessed to liking fellow finalists Che Chesterman and Reggie 'n' Bollie. "Che has a great voice and Reggie and Bollie are killing it," he adds.
The final trio are travelling the country in personalised tour buses this week, trying to drum up as much support as possible from the public in order to clinch a record deal with Simon Cowell's label Syco.
The bookies' favourite Louisa is in a strong position after her incredible renditions of 'It's a Man's World' and 'The Power Of Love.'
Jake's X Factor dream ended during the live shows where, despite his mentor Mel B's best efforts to save him, he was voted off after ending up in the bottom two with Only The Young.
That's not to say he hasn't done well for himself since, landing second place in I'm a Celebrity… Get Me Out Of Here 2014. And as we've seen in some years, X Factor winners don't always come out on top.
In 2010, One Direction came third to Matt Cardle and it's fair to say they've done alright - either way, we can't wait to see what happens this weekend!
By Cecily Ponsford