Postpublished at 19:25 Greenwich Mean Time 7 March 2015
We're back playing again but this won't be the end of it. A large number of fans are standing waiting to invade the pitch again.
Delph's low strike gives Villa the lead
Sinclair curls in from 15 yards
Yacob shown second yellow for tackle
Sub Grealish shown second yellow for diving
Fans invade pitch before full-time
Tom Rostance
We're back playing again but this won't be the end of it. A large number of fans are standing waiting to invade the pitch again.
Mark Lawrenson
MOTD Live
"Why would you do this? You're winning, absolutely stupid. Imagine if the referee abandoned the game now. Loads of villages have lost their idiots tonight. Absolutely bonkers."
Well this is ridiculous, it really is. Aston Villa fans have invaded the pitch. Not one or two either, a lot. What are they playing at? The majority of the fans inside the ground boo them, but play has to be halted temporarily. One fan steals the corner flag.
This is bizarre behaviour.
Mark Lawrenson
MOTD Live
"I'm not sure if he cheated, I'm really not. I don't think he was going to get the ball, but he was jumping out the way."
Aston Villa sub Jack Grealish has only been on the pitch for 15 minutes, but he's just been sent off for a second yellow card! He nicks the ball past Joleon Lescott and goes down, referee Anthony Taylor decides it is a dive and shows him a second booking.
Rob Moriarty:, external Are you watching Paul Lambert? This is why we wanted you to go! Attacking football, remember that?
Callum Gallagher:, external That's never a card or a sending off. Yacob stands his ground as the Villa player dives in. Nonsense decision.
Carl Hathaway:, external Absolutely brilliant goal from Sinclair.
Get involved via #bbcfootball,, external text us on 81111 (UK only) or pop your anecdote down on the BBC Sport Facebook, external and Google+ pages.
Pessimistic Villa fans will point out that Derby were 2-0 up going into stoppage time today - and only drew. It can happen!
Phil McNulty
BBC Sport chief football writer at Villa Park
"Sickening few moments for West Brom manager Tony Pulis - first with that harsh sending off for Claudio Yacob and then Scott Sinclair's second goal.
"Not that Aston Villa's fans care as their season has been revived in the space of seven days with a vital Premier League win and what now surely will be a trip to Wembley for the FA Cup semi-final."
Let's hope the game is not marred by crowd trouble. Aston Villa are going to Wembley, that should be the headline from this game.
Villa have FIVE MINUTES of added time to negotiate...
Former WBA and Villa forward Kevin Phillips at Villa Park
BBC Radio 5 live
"West Brom had to push forward and leave themselves open for the counter-attack and that's exactly how Aston Villa scored their goal. Game over. Well done Villa."
On the crowd unrest: "I have just looked over there and seen a seat come down. Do these supporters not have a brain because they are going to get picked out.
"It's scenes we don't want to see at football and it's going to take away from the match."
Mark Lawrenson
MOTD Live
"Brown Ideye's chance was massive wasn't it? Just massive. West Brom have been punished for not scoring when they were on top in the first half."
I'm already looking forward to seeing Tim Sherwood's Wembley suit. Or do you save the measuring up for the final? You probably should do.
Tony Pulis grimaces on the sidelines. His side have had their chances.
Mark Lawrenson
MOTD Live
"Well done Carlos Sanchez, who gets a header on the edge of the area allowing Villa to break. Scott Sinclair still did very well with the finish, but every touch on the way was just as important. A good second touch just took it out of his feet and then he was there to slot it home."
Aston Villa are going to Wembley! A clinical counter-attack puts them 2-0 up with five minutes left. Scott Sinclair wasted a good chance running though the left channel earlier on but he buries this one. He runs through, cuts back on to his right foot and curls the ball into the far corner to spark a mini pitch invasion.
Game over.
A change in the West Brom midfield as Youssouf Mulumbu replaces Craig Gardner.
Former WBA and Villa forward Kevin Phillips at Villa Park
BBC Radio 5 live
"I'm very surprised. That is never a sending off in a million years. The referee has got it wrong there. It's millimetres he has left the ground there. Claudio Yacob can be really disappointed he has been sent off. That can really turn the tide now in Villa's favour."
Mark Lawrenson
MOTD Live
"The Aston Villa player slides in here when he doesn't need to. There's no need to go in for a challenge when you might get hurt. Is that even a yellow card? For me, not at all.
"You will always get hurt when you go in for a challenge like that and I don't agree. If that's a yellow card, we might as well just ban tackling forever."
So who has been the hero of this FA Cup tale?
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A red card for West Brom midfielder Claudio Yacob! He jumps into the challenge, his feet leave the ground, but there doesn't look too much wrong with it as Villa midfielder Leandro Bacuna slides into him. Referee Anthony Taylor sees it as a second booking and Yacob is off.
That could be the end of West Brom's chances...
That's a great delivery! Brilliant corner from Chris brunt ties Shay Given in a knot, again it could be a tap-in at the far post but they can't quite touch it in...