The Irish ace caused a network blackout after the nip slip during the first match of the historic pay-per-view in Phoenix, Arizona, US.
The gaffe happened around halfway through the opener, which champion Asuka won and retained her SmackDown Live women's title.
Social media was sent into a frenzy over the incident, with viewers left in shock and creating a stir across Twitter.
The 31-year-old seemingly struggled with her top throughout the bout.
She went on to win the women's Royal Rumble in a shock entry after replacing the injured Lana at the last minute.
A similar incident happened last week when Sasha Banks' bum came out of her pants on Monday Night RAW.
One Twitter user said: "Did anyone catch, Becky Lynch's boob popping out?!
"That's why the screen went black."
Another added: "Did Becky's boob pop out?
"Bc my screen blacked out a quick second and when it came back she was fixing her top #RoyalRumble"
And one said: "Black screen again… Becky's boob must have popped out #RoyalRumble"
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