Remember that dreadful period a few years back when WWE would have a guest host on Raw every single week? They were pretty much always there to plug a film, album, political pamphlet, or whatever they are associated with.
Basically, they there to try and present WWE as a mainstream form of entertainment (which it isn't), to try and ease that chip Vince McMahon has on his shoulder about being seen as a wrestling promoter.
There were stars like Jeremy Piven (getting the name of SummerSlam wrong), Drew Carey wasting space in the Royal Rumble, The Muppets hosting Raw (everyone likes The Muppets, but seriously?) and so on and so on.
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However, once you get past the horrific cameo appearances, you see that some mainstream celebrities aren't afraid to show a love for pro wrestling, which see them get in on the fun with the wrestlers.
The following are the best four from recent memory.
Whilst he might like to be remembered as Wolverine or the guy from that film about Australia, to any decent wrestling fan, Hugh Jackman will always be remembered as Zack Ryder's Broski.
Yes, Jackman was promoting his movie Real Steel on Raw, but the man's enthusiasm made a pretty good attempt of running the ropes, breezed past the plug for his movie, and got involved in an angle.
Jackman came across very well on screen, clearly having a blast at the show, acting as Zack Ryder's second in a match with Dolph Ziggler, and engaging in horseplay with Brooklyn Brawler backstage afterwards.
His rather good looking punch to Ziggler even made the papers the day after, with the Showoff playing the kayfabe card and insisting that he might need jaw surgery. Well played all around.
Machine Gun Kelly
Not referring to Kelly's appearance at WrestleMania 28, where he sang John Cena out to the ring, but rather his appearance on Raw in June of last year, as he performed once more.
WM28 really provides the context as to why this worked so well, as MGK was booed ferociously by the 'Mania crowd. When Kelly made his Raw appearance, the crowd was ready to dislike him, and WWE seemed aware of this this time around.
At the conclusion of his mini gig, Kevin Owens, who was feuding with Cena at that time, came out and powerbombed the pop star off the stage to booming cheers. Owens had fast become a crowd favorite on the main roster, and Kelly, to his credit, took a potentially risky bump to aid his ascendancy.
'Rowdy' Ronda had been pictured in the crowd for WrestleMania 31 early on in the broadcast, and so it wasn't exactly a massive surprise when she was called into the ring by The Rock.
Stephanie McMahon and Triple H went face-to-face with the twosome of Rock and Rousey as the crowd cheered on the then-UFC champion. With her bizarre habit of never showing weakness to anyone on the roster, Steph refused to back down to the genuinely hard as nails Rousey, attempting to slap her before leaving her husband to absorb the take-down that would make all of the newspapers the day after.
Purely in terms on the publicity it generated, the angle was a huge success. In truth, it went on for far too long, at around twenty minutes (with Rock stalling for cheers, as always), but this segment may come back on screen as part of the deal UFC made to secure Brock Lesnar's services for his match with Mark Hunt.
As a dyed in the wool wrestling fan, Rousey would always be welcomed back by the WWE universe, as she clearly gets a real kick out of participating.
That Vince McMahon's political polar opposite would betray white bread John Cena shouldn't be too much of a shock in hindsight.
This one began early last year on Stewart's Daily Show with a Seth Rollins appearance that turned hostile. A Stewart appearance on Raw resulted in the WWE champion absorbing a kick to the groin from the satirist, which then led to Stewart's hosting SummerSlam.
During the WWE/US title unification match between Rollins and John Cena, Johnny boy made his presence known as he appeared in ring with a steel chair as the ref took a powder. Even though he telegraphed his heel turn by making like he didn't know which guy to hit, Stewart left to booming cheers as he cost Cena the win by helping his former adversary Rollins.
The explanation the comedian gave the next night on Raw was somewhat garbled (not wanting Cena to break Ric Flair's record), but it was nice to see Stewart take his lumps as Cena gave him an AA to close the book on this one.
Another genuine wrestling fan, Stewart's induction into the Hall of Fame celebrity wing is assured after his very game appearances on TV and PPV.
Have we missed any celebrity appearances out? Have YOUR say in the comment section below!