Ronda Rousey's move from UFC to WWE was one of the best-kept secrets in sport.

The former UFC Women's Bantamweight Champion had been flirting with a move across to sports entertainment for a while, but not many expected her to turn up at the Royal Rumble. 

After Asuka won the first ever 30-woman rumble, held on January 28, she was stood in the ring, about to announce who's title she wanted to go for, on Smackdown Live or Raw. 

When joined by the Smackdown Women's Champion Charlotte, as well as the Raw Women's Champion, Alexa Bliss, it appeared she had a straightforward decision to make. 

Cue Rousey, who entered from backstage, walking down the ramp and into the ring to make clear her intentions of fighting at Wrestlemania.  

Her Royal Rumble appearance was one that shocked WWE fans, but she's not been seen on TV since. However, Raw General Manager Kurt Angle has confirmed she's signing with the red brand.

Rousey is set to appear at the Raw exclusive Elimination Chamber pay-per-view this Sunday, where she will put pen to paper on a full-time WWE contract. 

Her arrival has got everyone around the WWE buzzing, but one current superstar has fired Rousey a warning - and she better listen. 

13-time WWE World Champion Randy Orton, who wrestles on Smackdown these days, has told TMZ Sports that Rousey can't just rely on her reputation as a UFC star. 

"She has a good chance of being one of the top female wrestlers eventually," he told TMZ, per the Sun

"But she's got a long way to go." 

Of course, with the female roster on both Raw and Smackdown perhaps the strongest it's ever been, to assume Rousey will walk in and become an instant title challenger is unfair. 

Especially considering she's got to battle with the likes of Asuka - who's currently undefeated in the WWE heading into Wrestlemania and the two current champs - Charlotte and Bliss. 

One thing is for sure though, Rousey is already a guaranteed sell-out star - but she'll have be at the top of her game every week to truly succeed in the WWE.  

Will Ronda Rousey be a success in WWE? Have YOUR say in the comments below.