The prince celebrated his 31st birthday with his friends in a private room in a West London pub on Tuesday night (15.09.15), and was joined for the occasion by the 26-year-old actress.
A source revealed: ''The party started at about 8pm and went on until about 1.30am. There was even a birthday cake with fireworks coming out of it.
''Cressida turned up with a female friend about 9.30pm and stood at the bar apparently waiting for Harry.
''She was there with him and his inner circle for the rest of the night, which shows how close they are.
''It's very early days and Harry is weighing up his options, but there are obviously still feelings there for Cressida.''
Harry and Cressida left the bash at different times, but the prince reportedly invited Cressida to join him at Kensington Palace for an after-party.
However, a palace source denied speculation he'd invited her back to his private quarters.
The insider shared: ''Harry wants to try and give his relationship with Cressida one more chance.''
Harry was recently linked to another of his ex-girlfriends, Chelsy Davy, but a relationship with Cressida was described as ''much more practical and realistic''.
The source told The Sun newspaper: ''Obviously it's not going to be nice for Chelsy to see, but she remains on good terms with Harry.
''There are definitely feelings there too but a relationship with Cressida feels much more practical and realistic.
''Chelsy has never wanted a royal life.''
From their newest EP 'What Did You Think When You Made Me This Way', Nothing But Thieves drop the lyric video for their single 'Take This Lonely...
The Lumineers honour their friend and hero Tom Petty with a sensational cover of his 1996 song 'Walls' from the 'She's the One' soundtrack.
Watch Olly Murs get his nerd on as he blags his way into an exclusive Snoop Dogg party (where Rowan Atkinson is the bartender) in the video for their...
From 'Happy' to 'Banana Pancakes', these are soaked in positivity.
Mariah Carey is the picture of glamour in the black and white video for her brand new single 'With You'. It's the lead single from her forthcoming...
Eminem draws attention to the negative response his 2017 album 'Revival' received in the video for his latest song 'Venom'; a song recorded for the...
With the recent release of her third, very well received album 'Hunter' just behind her, Anna had plenty of relatively new songs to showcase.