It seems the relationship between Bollywood's young heart throbs couple is going through tough times. But being the good actors that they are, they are not making it visible on their cute faces. We are talking about Ranbir Kapoor and Deepika Padukone.

A close pal of the couple reveals, "Last week Deepika was to join Ranbir for going to Dostana director Tarun Mansukhani's birthday party at late night.

Since she got stuck due to her work commitments (shooting of Excel Entertainment's Kartik Calling Kartik), Ranbir told her he would go alone to the party. But despite telling her so, he didn't go their.

Instead he chose to attend another party that had his debut film Saawariya heroine Sonam Kapoor and her good friend Kunal Kapoor. He didn't tell this to Deepika who was well under the impression for days that he was at Tarun's party.

The birthday party saw new love birds Shahid Kapoor and Priyanka Chopra making and entry and exit together publicly for the first time. John Abraham and Bipasha Basu too came in for the bash.

When Deepika came to know about Ranbir's lie, it is learnt that she lambasted him over the phone while he kept giving her excuses such as how it was all a last minute change in his plan etc."

Now when we encountered Deepika at the latest Filmfare magazine issue launch and asked her about any strains in relationship happening between her and Ranbir, she questioned us back with a smile, "Do I appear hassled to you?"

Well certainly not Deepika but it is also true that you are a very fine actress.

Just days back, Ranbir's sister Riddhima told to a news channel journo on TV that she doesn't think Deepika is Ranbir's girlfriend and that she knows Deepika only as one of his good friends.

With news of Ranbir striking great rapport on and off the sets with his Ajab Prem Ki Ghazab Kahani co-star Katrina Kaif, we wont be left wondering when Deepika also starts losing sleep just like Salman Khan is over his partner.